A giant battle had taken place inside the mist, and it was hard to fully see what was going on. When all of the figures were condensed in one area, the mist seemed to move away from them, but now fighting was going on all over the place.
Just as Arthur said, they weren't the only ones that wished to help Quinn. There were plenty of those among them that now saw a chance to fight back against the others. Arthur, Leo, and Erin were doing the most damage.
As Arthur was blocking the majority of the attacks with his shadow, rather than focusing on the big enemies, he was going for mass destruction. Leo was doing a similar thing; with his power, he could sense those who were weaker.
Seeing all of this, it did make Quinn wonder if, since the others were disappearing, it meant Arthur, Leo, Erin, and the rest were taking the pain that he was meant to take. With each kill, each touch, were they going through their pain again?