Bro has a black card.
The idea of destroying parts is just like Monster Hunter. I remember stressing over getting the horns or nails destroyed before I finish off the monster. The worst is the back part especially if the monster is big.
Here's my guess as to the next chapter:
She feels guilty for getting the red license the way she did, because she knows she didn't really beat that monster with her own power. Now she wants Oji-san to accompany her until she can defeat one one her own.
It would be nice if she did. "MC beats up powerful monster while a young girl commentates" is kinda boring, reading about a girl putting in effort to become stronger trained by a veteran sound much more interesting.
I there is a series with the exact premise where the guy is s rank super strong is woman cheats on him and forced out. You then proceeds to help a young woman train and gets stronger forget what's called though, but don't think it has too many chapters for now