Spider tweaks and Mob pulling (#17782)

* Spider tweaks and Mob pulling

Added a small amount of weaken to spider warning bites to knock people over.
Added a new variable to mobs that can prevent them from being pulled when alive, currently only applies to the spiders.
Fixed an issue where spiders would sometimes try to inject poison where they couldn't and runtime.

* Invert var

code/modules/mob/living/simple_mob/subtypes/animal/giant_spider/_giant_spider.dm

@@ -127,6 +127,8 @@
 	var/warning_warmup = 2 SECONDS // How long the leap telegraphing is.
 	var/warning_sound = 'sound/weapons/spiderlunge.ogg'
 
+	no_pull_when_living = TRUE
+
 
 /mob/living/simple_mob/animal/giant_spider/Initialize(mapload)
 	. = ..()
@@ -204,7 +206,8 @@
 		break
 
 	if(victim)
-		A.reagents.add_reagent(REAGENT_ID_WARNINGTOXIN, poison_per_bite)
+		victim.reagents.add_reagent(REAGENT_ID_WARNINGTOXIN, poison_per_bite)
+		victim.AdjustWeakened(2)
 		victim.visible_message(span_danger("\The [src] has bitten \the [victim]!"))
 		to_chat(victim, span_critical("\The [src] bites you and retreats!"))
 		. = TRUE

code/modules/mob/mob.dm

@@ -607,6 +607,10 @@
 		else
 			M.LAssailant = usr
 
+		if(M.no_pull_when_living && !(M.stat == DEAD)) //If it's now allowed to be pulled when living, and it's not dead yet, deny.
+			to_chat(src, span_warning("\The [M] won't let you just pull them!"))
+			return
+
 	else if(isobj(AM))
 		var/obj/I = AM
 		if(!can_pull_size || can_pull_size < I.w_class)

code/modules/mob/mob_defines.dm

@@ -120,6 +120,7 @@
 	var/m_intent = I_RUN//Living
 	var/lastKnownIP = null
 	var/obj/buckled = null//Living
+	var/no_pull_when_living = FALSE //Test for if it can be pulled when alive
 
 	var/seer = 0 //for cult//Carbon, probably Human