amends

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

@@ -56,7 +56,11 @@
 		HM.on_move(NewLoc)
 	if(. && (combat_flags & COMBAT_FLAG_SPRINT_ACTIVE) && !(movement_type & FLYING) && CHECK_ALL_MOBILITY(src, MOBILITY_MOVE|MOBILITY_STAND) && m_intent == MOVE_INTENT_RUN && has_gravity(loc) && (!pulledby || (pulledby.pulledby == src)))
 		if(!HAS_TRAIT(src, TRAIT_FREESPRINT))
-			doSprintLossTiles(1)
+			var/datum/movespeed_modifier/equipment_speedmod/MM = get_movespeed_modifier_datum(/datum/movespeed_modifier/equipment_speedmod)
+			var/amount = 1
+			if(MM)
+				amount *= (1 + (1 - (1 / MM.multiplicative_slowdown)))
+			doSprintLossTiles(amount)
 		if((oldpseudoheight - pseudo_z_axis) >= 8)
 			to_chat(src, "<span class='warning'>You trip off of the elevated surface!</span>")
 			for(var/obj/item/I in held_items)

code/modules/movespeed/_movespeed_modifier.dm

@@ -236,6 +236,13 @@ GLOBAL_LIST_EMPTY(movespeed_modification_cache)
 		var/datum/movespeed_modifier/M = movespeed_modification[id]
 		. += M.multiplicative_slowdown
 
+/**
+  * Gets the movespeed modifier datum of a modifier on a mob. Returns null if not found.
+  * DANGER: IT IS UP TO THE PERSON USING THIS TO MAKE SURE THE MODIFIER IS NOT MODIFIED IF IT HAPPENS TO BE GLOBAL/CACHED.
+  */
+/mob/proc/get_movespeed_modifier_datum(id)
+	return movespeed_modification[id]
+
 /// Checks if a move speed modifier is valid and not missing any data
 /proc/movespeed_data_null_check(datum/movespeed_modifier/M)		//Determines if a data list is not meaningful and should be discarded.
 	. = TRUE