oh god oh FUCK

code/modules/mob/living/carbon/human/human.dm

@@ -245,7 +245,7 @@
 			var/slot = text2num(href_list["item"])
 			if(slot in check_obscured_slots())
 				to_chat(usr, "<span class='warning'>You can't reach that! Something is covering it.</span>")
-				return							
+				return
 		if(href_list["pockets"])
 			var/strip_mod = 1
 			var/strip_silence = FALSE

code/modules/mob/living/carbon/human/human_defines.dm

@@ -7,12 +7,14 @@
 	buckle_lying = FALSE
 	mob_biotypes = MOB_ORGANIC|MOB_HUMANOID
 	/// Enable stamina combat
-	combat_flags = COMBAT_FLAGS_DEFAULT
+	combat_flags = COMBAT_FLAGS_DEFAULT | COMBAT_FLAG_UNARMED_PARRY
 	status_flags = CANSTUN|CANKNOCKDOWN|CANUNCONSCIOUS|CANPUSH|CANSTAGGER
 	has_field_of_vision = FALSE //Handled by species.
 
 	blocks_emissive = EMISSIVE_BLOCK_UNIQUE
 
+	block_parry_data = /datum/block_parry_data/unarmed/human
+
 	//Hair colour and style
 	var/hair_color = "000"
 	var/hair_style = "Bald"
@@ -71,3 +73,50 @@
 	var/lastpuke = 0
 	var/account_id
 	var/last_fire_update
+
+/// Unarmed parry data for human
+/datum/block_parry_data/unarmed/human
+	parry_respect_clickdelay = TRUE
+	parry_stamina_cost = 4
+	parry_attack_types = ATTACK_TYPE_UNARMED
+	parry_flags = PARRY_DEFAULT_HANDLE_FEEDBACK | PARRY_LOCK_ATTACKING
+
+	parry_time_windup = 0
+	parry_time_spindown = 1
+	parry_time_active = 5
+
+	parry_time_perfect = 1
+	parry_time_perfect_leeway = 1
+	parry_imperfect_falloff_percent = 20
+	parry_efficiency_perfect = 100
+
+	parry_efficiency_considered_successful = 0.01
+	parry_efficiency_to_counterattack = 0.01
+	parry_max_attacks = 3
+	parry_cooldown = 30
+	parry_failed_stagger_duration = 0
+	parry_failed_clickcd_duration = 0.4
+
+	parry_data = list(			// yeah it's snowflake
+		"HUMAN_PARRY_STAGGER" = 3 SECONDS,
+		"HUMAN_PARRY_PUNCH" = TRUE,
+		"HUMAN_PARRY_MININUM_EFFICIENCY" = 0.9
+	)
+
+/mob/living/carbon/human/on_active_parry(mob/living/owner, atom/object, damage, attack_text, attack_type, armour_penetration, mob/attacker, def_zone, final_block_chance, list/block_return, parry_efficiency, parry_time)
+	var/datum/block_parry_data/D = return_block_parry_datum(block_parry_data)
+	if(parry_efficiency >= D.parry_data["HUMAN_PARRY_MINIMUM_EFFICIENCY"])
+		visible_message("<span class='warning'>[src] strikes back perfectly at [attacker], staggering them!</span>")
+		if(D.parry_data["HUMAN_PARRY_PUNCH"])
+			// snowflake, yay
+			if(ishuman(attacker) && dna?.species)
+				dna.species.harm(src, attacker, mind?.martial_art, TRUE)
+			else
+				var/old = a_intent
+				a_intent = INTENT_HARM
+				UnarmedAttack(attacker)
+				a_intent = old
+		var/mob/living/L = attacker
+		if(istype(L))
+			L.Stagger(D.parry_data["HUMAN_PARRY_STAGGER"])
+	return ..()

code/modules/mob/living/carbon/human/species.dm

@@ -1444,7 +1444,7 @@ GLOBAL_LIST_EMPTY(roundstart_race_names)
 		target.grabbedby(user)
 		return 1
 
-/datum/species/proc/harm(mob/living/carbon/human/user, mob/living/carbon/human/target, datum/martial_art/attacker_style)
+/datum/species/proc/harm(mob/living/carbon/human/user, mob/living/carbon/human/target, datum/martial_art/attacker_style, parry = FALSE)
 	if(!attacker_style && HAS_TRAIT(user, TRAIT_PACIFISM))
 		to_chat(user, "<span class='warning'>You don't want to harm [target]!</span>")
 		return FALSE
@@ -1456,10 +1456,11 @@ GLOBAL_LIST_EMPTY(roundstart_race_names)
 			target_message = "<span class='warning'>[target] blocks your attack!</span>")
 		return FALSE
 
-	if(HAS_TRAIT(user, TRAIT_PUGILIST))//CITADEL CHANGE - makes punching cause staminaloss but funny martial artist types get a discount
-		user.adjustStaminaLossBuffered(1.5)
-	else
-		user.adjustStaminaLossBuffered(3.5)
+	if(!parry)
+		if(HAS_TRAIT(user, TRAIT_PUGILIST))//CITADEL CHANGE - makes punching cause staminaloss but funny martial artist types get a discount
+			user.adjustStaminaLossBuffered(1.5)
+		else
+			user.adjustStaminaLossBuffered(3.5)
 
 	if(attacker_style && attacker_style.harm_act(user,target))
 		return TRUE
@@ -1497,13 +1498,16 @@ GLOBAL_LIST_EMPTY(roundstart_race_names)
 		var/obj/item/bodypart/affecting = target.get_bodypart(ran_zone(user.zone_selected))
 
 		var/miss_chance = 100//calculate the odds that a punch misses entirely. considers stamina and brute damage of the puncher. punches miss by default to prevent weird cases
-		if(user.dna.species.punchdamagelow)
-			if(atk_verb == ATTACK_EFFECT_KICK) //kicks never miss (provided your species deals more than 0 damage)
-				miss_chance = 0
-			else if(HAS_TRAIT(user, TRAIT_PUGILIST)) //pugilists have a flat 10% miss chance
-				miss_chance = 10
-			else
-				miss_chance = min(10 + max(puncherstam * 0.5, puncherbrute * 0.5), 100) //probability of miss has a base of 10, and modified based on half brute total. Capped at max 100 to prevent weirdness in prob()
+		if(parry)
+			miss_chance = 0
+		else
+			if(user.dna.species.punchdamagelow)
+				if(atk_verb == ATTACK_EFFECT_KICK) //kicks never miss (provided your species deals more than 0 damage)
+					miss_chance = 0
+				else if(HAS_TRAIT(user, TRAIT_PUGILIST)) //pugilists have a flat 10% miss chance
+					miss_chance = 10
+				else
+					miss_chance = min(10 + max(puncherstam * 0.5, puncherbrute * 0.5), 100) //probability of miss has a base of 10, and modified based on half brute total. Capped at max 100 to prevent weirdness in prob()
 
 		if(!damage || !affecting || prob(miss_chance))//future-proofing for species that have 0 damage/weird cases where no zone is targeted
 			playsound(target.loc, user.dna.species.miss_sound, 25, TRUE, -1)

tgstation.dme

@@ -119,8 +119,10 @@
 #include "code\__DEFINES\wall_dents.dm"
 #include "code\__DEFINES\wires.dm"
 #include "code\__DEFINES\_flags\_flags.dm"
+#include "code\__DEFINES\_flags\do_after.dm"
 #include "code\__DEFINES\_flags\item_flags.dm"
 #include "code\__DEFINES\_flags\obj_flags.dm"
+#include "code\__DEFINES\_flags\shields.dm"
 #include "code\__DEFINES\admin\keybindings.dm"
 #include "code\__DEFINES\combat\attack_types.dm"
 #include "code\__DEFINES\combat\block.dm"
@@ -128,8 +130,6 @@
 #include "code\__DEFINES\dcs\flags.dm"
 #include "code\__DEFINES\dcs\helpers.dm"
 #include "code\__DEFINES\dcs\signals.dm"
-#include "code\__DEFINES\flags\do_after.dm"
-#include "code\__DEFINES\flags\shields.dm"
 #include "code\__DEFINES\mapping\maploader.dm"
 #include "code\__DEFINES\material\worth.dm"
 #include "code\__DEFINES\misc\return_values.dm"