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Quadritch gets his mech suit and knife
Fight to the death in the Amazon jungle
Who wins?

Miles Quadritch kicks all types of ass in his mech. He wins

Isn't the alien capable of huge magnetic abilities?

I think it has magnetic abilities, due to the disruption of the military's hardware.

But as far as pure physical combat goes, i think the alien may be a challenge for Quadritch. It was fast as hell, destroying cars, flipped over and tore through a bus, tanked an entire assault rifle clip to the face, tanked the HUGE train crash and broke itself out of the boxcar, etc.