Isa Eland Burns Deralumin and Atium, It Pulls Most of Them Into the Spiritual Realm?

When he burns atium and deralumin at the same time, it pulls most of him into the spiritual realm. I wonder if that's because he is close to being omniscient, sort of in a way,. In that moment, which is the prerogative of the divine ra. Kelsier is able to hold that for a little while, and when he can, he has the experience like always being on atium, always being powered up.