I think a key point is if you run up and down the hallway you will always have Awe up when he spawns the adds. He is slow and just the curves of the hall mean he can't really be damaging you at all and you have time to recharge awe and medpacs.
The point, though, is that the developers said this fight was calibrated without
LOSing the emperor or his clones. At no point should you have had to run down the hallway just to refresh a CD. Supposedly, you're able to fight the emperor like every other battle you've had in your Knightly career and win.
Yet every successful guide involves kiting, LOSing, etc. Even though who optimized their interrupts at every turn were LOSing just to renew their cooldowns.