User blog comment:B214/Volume 17 spoilers./@comment-23853100-20140220152640/@comment-24468758-20140221010805

As Draig said in Vol.2 even if he loses he just has to get back up and win and as we all know that is exactly what Issei always does.

I agree with JJJ and in regards to Grendel:

The huge sphere of destruction increases its shininess and envelops the Evil Dragon. What’s left after the sphere of destruction disappears is—Grendel’s aftermath where he only has half of his head left.

Still thinking he took only light damage of half his face?