That's neat, but a huge exertion investment for one round of combat. Imagine how crushing it would be not to get attacked after that. Or worse, crit. I feel like you'd want to mitigate those two things.Amusingly, if you combo it with Heightened Reflexes you can give yourself up to a d8 on your AC against a single opponent and should they miss take 3 attacks on them. I think I got one of my next Fighter builds...