User blog comment:Piyush Banerjee/Shin DxD 2 discussion/@comment-34061653-20190122110131/@comment-36523287-20190128031405

Unless he struggled to do so, I don't think Issei had that much trouble. Most fighters will block or dodge enemy's attacks as a default. Back to Vol.8, Sirzech also countered Issei's Dragon Shot with his POD and nobody claimed that Sirzech was in troubles. Furthermore, Dressbreak technically worked against Rias. She just prepared a mean to recover from its effect. There was a short moment before Gasper reattached himself with Rias, and this is the most vulnerable moment for her. Issei could simply shot her with Dragon Shot, but he use Nyuutron Beam to ensure that Rias couldn't launch any counterattacks.