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Both extra strong but apparently unkillable protagonists meet for a dust up.

Lots of bludgeons and the occasional gun lying around.

Who wins?

I'd give it to David, as Jack while immortal, can still be injured and David preassumably can't. So maybe David finds a way to rip off Jack's arms and Black Knight's his ass.

Be one hell of a long fight and it could end in a stalemate

Jack can be injured but seems unkillable while Dunn seems invulnerable but has a weakness. If Jack can get him in water the fight is over.