Holy shit I really like this manga.
First of all, I love how instead of wasting panels of MC explaining and handing out their gears, he incorporated that into the fight scene. Secondly, this is the perfect time for the hero to be questioning the MC, and rather than doing it in a bland and generic manner like "What in the world are you??!!!!", it's done in a VERY good way. Instead of going "I'm the hero! You can't be stronger than me!" he calmly explains that what he's doing is super unnatural.