Board Thread:Questions and Answers/@comment-24098614-20161224043844/@comment-95.146.230.40-20181120142221

Accel is having a complete and utter mental breakdown at the time and he lashes out at Touma. He's angry at Touma for not willing to protect Last Order; just to point out he's not thinking rationally and he doesn't actually blame Touma at all.

Accel has a very low opinion of himself but a very high opinion of Touma to the point he actually is putting Touma on a very high pedestal.

'''“It’s ridiculous that a villain who was no better than a piece of shit like me was guarding her!! No matter how you think about it something must have been wrong!! How could I possibly be a hero!! No matter what, I can only choose the blood-stained path!! Why do I have to do all these things!! If a hero like you had shown up earlier, then something like this mix-up of position wouldn’t have happened!! That brat would not had to have suffered as much this way!!”'''

He doesn't think that he should be the one guarding and protecting last Order. He thinks it should be someone like Touma.

This fight actually is the point where we see massive character development in Accel. We also see massive character development in Touma as well because the fight really makes the two realize some important things.