Michael's secondary body observed the fight from the Untamed Jungle the whole time. He used a Memory Projector, allowing everyone present to watch what was happening.
He was not too prone to sharing the situation with everyone, but Alice, Lucia, Kaleb, and basically everyone else had asked for it. They were too interested in the demise of the Supreme Human Alliance and wanted to see Michael fight the gods. Michael couldn't reject them just like that. There was no good reason to do so. If one excluded that the fight was going to be gory and that he didn't want his daughter to watch something this gory.