Pocket Aces and a beginner

[shant]

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The pot is something like 23BB when it gets to Hero on the river.
CO could be trying to shut Hero out of the GIGANTIMUNGONORMOUS pot and get it HU with maniac on the river.

IMO CO is raising with a worse hand than Hero more than the required 9% of the time for Hero to make the call.

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This is a good point. The CO would have to be a pretty advanced player to be trying this after that turn action, but you have a point. I think it's closer than I originally thought, but it's still definitely a fold the second time around.