Fix a few things with grabs

Previous commit broke a few things, this one fixes it

Fixed;
 - Runtime error of trying to assign something that was deleted
 - Nonsensical functionality

code/modules/mob/mob_grab.dm

@@ -66,6 +66,7 @@
 	confirm()
 
 	if(assailant.client)
+		if(!hud)	return //this somehow can runtime under the right circumstances
 		assailant.client.screen -= hud
 		assailant.client.screen += hud
 
@@ -126,7 +127,7 @@
 			if(affecting.loc != assailant.loc)
 				force_down = 0
 			else
-				affecting.Weaken(1)
+				affecting.Weaken(3) //1 wears off too quick
 
 	if(state >= GRAB_NECK)
 		affecting.Stun(5)  //It will hamper your voice, being choked and all.
@@ -266,7 +267,7 @@
 /obj/item/weapon/grab/attack(mob/living/M, mob/living/carbon/user)
 	if(!affecting)
 		return
-
+
 	if(M == affecting)
 		if(ishuman(M) && ishuman(assailant))
 			var/mob/living/carbon/human/affected = affecting
@@ -282,7 +283,7 @@
 						assailant << "<span class='warning'>You require a better grab to do this.</span>"
 						return
 					var/obj/item/organ/external/organ = affected.get_organ(check_zone(last_hit_zone))
-					if(!organ || organ.is_broken())
+					if(!organ || organ.is_broken() || organ.limb_name == "chest" || organ.limb_name == "groin") //necessary to prevent chest and groin
 						return
 					assailant.visible_message("<span class='danger'>[user] is jointlocking [affecting]'s [organ.name]!</span>")
 					var/armor = affected.run_armor_check(affecting, "melee")
@@ -355,17 +356,17 @@
 
 
 	if(M == assailant && state >= GRAB_AGGRESSIVE) //no eatin unless you have an agressive grab
-		if(checkvalid(user, affecting)) //wut
+		if(checkvalid(user, affecting)) //wut
 			var/mob/living/carbon/attacker = user
 			user.visible_message("<span class='danger'>[user] is attempting to devour \the [affecting]!</span>")
 
 			if(!do_mob(user, affecting) || !do_after(user, checktime(user, affecting))) return
 
 			user.visible_message("<span class='danger'>[user] devours \the [affecting]!</span>")
-
+
 			affecting.loc = user
 			attacker.stomach_contents.Add(affecting)
-			qdel(src)
+			qdel(src)
 
 /obj/item/weapon/grab/proc/checkvalid(var/mob/attacker, var/mob/prey) //does all the checking for the attack proc to see if a mob can eat another with the grab
 	if(ishuman(attacker) && (FAT in attacker.mutations) && iscarbon(prey) && !isalien(prey)) //Fat people eating carbon mobs but not xenos
@@ -410,4 +411,4 @@
 #undef EAT_TIME_XENO
 #undef EAT_TIME_FAT
 
-#undef EAT_TIME_MOUSE
+#undef EAT_TIME_MOUSE