I assume the breathing was because Anakin’s lung’s got burned beyond repair, but really, I thought the whole fight on the lava planet was absurd. I liked the idea that Anakin’s injuries were the cause of radiation poisoning. I don’t know if you can be protected from death of radiation poisoning though. It depends on exposure level and time.

The whole fight between Anakin & Obi Wan was nonsense. I thought that the fight might have occurred on Dagobah as that would help explain the cave scene in Empire. I thought Anakin’s injuries were more gradual and were caused by various fights with Jedi over time. The fight with Obi Wan was the most severe. But I don’t think we should have seen Anakin get surgery & put in the suit. It should have been left to assume he dies in episode II or III with maybe just a hint that he is still alive. That way it is still a surprise when we find out you know what in Empire.