I know it is a power up story. You can want to him powerful but you cant want from him change his personality. Do you want to him more confident than before? He has had already confident about swordsmanship.

@Lingling a man doesn't express interest always a girl. Blushing in front of mc isn't bad thing. He is personality like this. how can we blame him ? Also, people mind always have a this idea; a man always must be strong, interested in girls.+