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Ok, we know that Patches didn't really die earlier (unless he has come back to life, which would be gay). So obviously he had some means of making himself foam at the mouth and did a good job of faking his death in the electromagnetic field (which we now know was not turned on, so he was probably just faking).
We know the others have the technology to implant chips in people that mess 'em up - like they did with Claire. Maybe Patchy has one that produces superficial but seemingly serious wounds?