It's like some type of apoo blast. If it's Luffy COA barrier it will cover his face. But it didn't.
Cope. There is no panel Ulti break a barrier.
Luffy saw Ultis CoA being too strong and tried to prevent it with barrier and still failed
Shishio coming to cry every Luffy feat.
Don't you see Full Body Haki post Barrier Luffy nearly die to Forth of July fire works?