I kid you not, this sod JUST WOULD NOT DIE lol.... Kept popping his head like a zit... and POOF... he would re-appear.
The Xbox recording system missed the bit where he finally died sadly...
EDIT: From now on, I'm going to dub this guy SUPERVAN.
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It's not a bug, it's a feature. Self-resurrecting enemies, to keep you on your toes!