Are there any other skills that don't damage during DR?

When PB starts the DR animation, take note of the time and add 17 to the clock. That's the point that you should stop spamming attacks.

Ex: DR's at 15, stop attacking at 32. Only attack when PB is in an attack animation.

Okay, that confused me a bit. You're saying if he DR's at 45:15, I should wait until he stops DRing, then attack until 44:32?
Why only attack PB when he's in attack animation? I've heard this before but I'm wondering why this is needed (if the 17 second timer thing works like I think it does)?