Fixes revenants being unable to siphon after failing a siphon

code/modules/antagonists/revenant/revenant_abilities.dm

@@ -58,6 +58,7 @@
 					to_chat(src, "<span class='revenminor'>Something's wrong! [target] seems to be resisting the siphoning, leaving you vulnerable!</span>")
 					target.visible_message("<span class='warning'>[target] slumps onto the ground.</span>", \
 											   "<span class='revenwarning'>Violets lights, dancing in your vision, receding--</span>")
+					draining = FALSE
 					return
 				var/datum/beam/B = Beam(target,icon_state="drain_life",time=INFINITY)
 				if(do_after(src, 46, 0, target)) //As one cannot prove the existance of ghosts, ghosts cannot prove the existance of the target they were draining.