I'm wondering if Palpatine really was exhausted or was he faking it so that Anakin would have to help him, and thus bringing him over to the dark side. When windu was gone Palpatine got up pretty easily, was quite calm and wasnt even breathing heavy after all that...

I mean windu won vs Palpatine, yet Yoda who's supposed to be the strongest jedi(not sure about this?) made it to a draw.

Oh and the fiery planet is in the Mustafaar system I think.