Yeah, the problem with BCoB Turn 5 at this point is simple: SCoB Turn 2 enraged mode. If the one shot mechanic from that fight was still forcing people to learn it then by the time they got to Turn 5 they'd have a better grasp of paying attention to things like debuff icons and quick reactions. Turns 1, 2 (enrage) and 4 with i100 and 20% echo don't prepare you for the smash in the face that you get from pushed back twisters and non-focused targeted mobs for cast bar awareness. The only solution would be nerf those attacks even more as no amount of echo is going to improve reaction time.