Originally Posted by Unregistered

It's definitely a bug. It will continue until the enemy dies, even against raid bosses.

But that's not exactly what's happening; it's not like it's one hit being countered and the unit keeps countering the one attack until the enemy dies.

It's multiple hits triggering multiple counters; at least from what I'm seeing. It would definitely be a bug if more counters were being generated than enemy attacks, but that didn't seem to be the case from the video.