Rewrote targeting.

code/modules/projectiles/targeting/targeting_triggers.dm

@@ -0,0 +1,29 @@
+/mob/living/proc/trigger_aiming(var/trigger_type)
+	if(!aimed.len)
+		return
+	for(var/obj/aiming_overlay/AO in aimed)
+		if(AO.aiming_at == src)
+			AO.update_aiming()
+			if(AO.aiming_at == src)
+				AO.trigger(trigger_type)
+				AO.update_aiming_deferred()
+
+/obj/aiming_overlay/proc/trigger(var/perm)
+	if(!owner || !aiming_with || !aiming_at || !locked)
+		return
+	if(perm && (target_permissions & perm))
+		return
+	if(!owner.canClick())
+		return
+	owner.setClickCooldown(5) // Spam prevention, essentially.
+	if(owner.a_intent == I_HELP)
+		owner << "<span class='warning'>You refrain from firing \the [aiming_with] as your intent is set to help.</span>"
+		return
+	owner.visible_message("<span class='danger'>\The [owner] pulls the trigger reflexively!</span>")
+	var/obj/item/weapon/gun/G = aiming_with
+	if(istype(G))
+		G.Fire(aiming_at, owner)
+
+/mob/living/ClickOn(var/atom/A, var/params)
+	. = ..()
+	trigger_aiming(TARGET_CAN_CLICK)