Feels weird for Rude to be "it's my fault too" when it wasn't his fault at all, like when would he even have a chance to figure out his skills when they were going to the dungeon non-stop....
Also Rude sure seems to be taking it easy about his sister's condition, wasn't that the reason he pushed himself to conquer the dungeon ASAP? Hope we get back to that part of the story since that made the focus of Rude and the story interesting.