I also like the theory that what kept Anakin alive after getting burned was his hatred for Kenobi. We all know that hate can be a powerful motivator and I'd imagine it's what bought him enough time until Palpatine showed up (not that he was aware that Palpatine was coming to rescue him). Can we acknowledge that for the flaws of ROTS, that shot of Palpatine kneeling down to Anakin on the lava bank is still one of the coolest shots in the entire saga.