Board Thread:Questions and Answers/@comment-25051789-20140627010334/@comment-24282510-20140627012343

Kiyuna wrote: Guess that's meant to show that he's powering up/ using alot of reiatsu. Like, his reiatsu is blue, so his eyes turn blue, duh. I'm not exactly sure but i think when Kenpachi used his yellow reatsu his eye were yellow too.

This

Doesn't after that he normally go bankai/release a brust of resiatsu followed by a GT that is more powerful then before?

So my guess is like Kiyuna is he is powering up.