Added catching. Wow that was easy.

code/modules/mob/living/carbon/alien/alien_defenses.dm

@@ -0,0 +1,2 @@
+/mob/living/carbon/alien/hitby(atom/movable/AM)
+	..(AM, 1)

code/modules/mob/living/carbon/carbon_defenses.dm

@@ -0,0 +1,12 @@
+/mob/living/carbon/hitby(atom/movable/AM, skip)
+	if(!skip)  //ugly, but easy
+		if(in_throw_mode && !get_active_hand())  //empty active hand and we're in throw mode
+			if(canmove && !restrained())
+				if(istype(AM, /obj/item))
+					var/obj/item/I = AM
+					if(isturf(I.loc))
+						put_in_active_hand(I)
+						visible_message("<span class='warning'>[src] catches [I]!</span>")
+						throw_mode_off()
+						return
+	..()