Fixed the time multiples so it doesn't nerf anyon

code/modules/surgery/surgery_steps.dm

@@ -102,8 +102,8 @@ affected_limb, or location vars. Also, in that case there may be a wait between
 
 	if(ispath(tool_type)) //Tool speed modifier. This means hand & any item are 100% efficient as surgical tools.
 		tool_modifier = tools[tool_type]
-	if(skillcheck(user, SKILL_IMPROVISATION_SKILLED))
-		step_duration *= 1 + (tool_modifier - 1 * get_skill_duration_multiplier(SKILL_IMPROVISATION))
+	if(skillcheck(user, SKILL_IMPROVISATION, SKILL_IMPROVISATION_SKILLED))
+		step_duration *= 1 + (tool_modifier * user.get_skill_duration_multiplier(SKILL_IMPROVISATION))
 
 	if(surgery.lying_required) //Surgery surface modifier.
 		surface_modifier = target.buckled?.surgery_duration_multiplier //If they're buckled, use the surface modifier of the thing they're buckled to.
@@ -112,8 +112,8 @@ affected_limb, or location vars. Also, in that case there may be a wait between
 			for(var/obj/surface in get_turf(target)) //Otherwise, get the lowest surface modifier of objects on their turf.
 				if(surface_modifier > surface.surgery_duration_multiplier)
 					surface_modifier = surface.surgery_duration_multiplier
-	if(skillcheck(user, SKILL_IMPROVISATION_MASTER))
-		step_duration *= 1 + (surface_modifier - 1 * get_skill_duration_multiplier(SKILL_IMPROVISATION + 0.25))
+	if(skillcheck(user, SKILL_IMPROVISATION, SKILL_IMPROVISATION_MASTER))
+		step_duration *= 1 + (surface_modifier * user.get_skill_duration_multiplier(SKILL_IMPROVISATION))
 
 	var/list/human_modifiers = list("surgery_speed" = 1.0, "pain_reduction" = 0)
 	SEND_SIGNAL(user, COMSIG_HUMAN_SURGERY_APPLY_MODIFIERS, human_modifiers)