But there would need to be fire present.
If were in an enclosed room and they only had their powers and wits, AM's metal form couldn't do anything to PM, and the best he could do is become like PM....but then he wouldn't have as good of control over his powers as PM does.
Still, if he can absorb any sort of energy, the fight should be over quick. In my scenario, it would be possible but unlikely for PM to win.
-DM