I tend to lean towards what Melon has said. I would expect a bit more than minor inconvenience damage too in this instance, but I think the case can be stated for it not being lethal and combat still technically able to take place.

Largely, my rationale is based on how quickly this is taking place and at a fairly close range. Even assuming incredible processing speeds, to react to that spell in that timeframe is questionable to me (this is not a level of combat I'm a fan of). However, we will disregard that since it seems to be consistent with the actions in the previous parts of the fight. And while it may not be a complex set of actions for Corban, he still has to complete the OODA loop and each step takes at least a moment.