Attacker taking damage in class side quest

Guys, I am doing the mutant class side quest. Everything is peachy until I encountered KP. I noticed that when the impending damage charges on him exceeds 10 my attackers (Gentle and NTW) were taking persistent damage.

Is this what’s supposed to happen? I don’t read anything about attacker taking damage when the charge is over 10 (if my understanding is correct the damage should be on defender).

If this is intended, then how can I make the charge to drop? Anything I did to him increases the charge. Should I just wait them to expire? My attackers can’t sustain that long when they begin to take damage.