Hahaha... yes, Rei, you need to be around Hina to keep the 'riff-raff' away form her. Being on 'overwatch' isn't enough. Also big dumb flexing his pro Shogi muscles against an amateur like that out of jealousy and self-sabotaging his club. I'll be honest, at the end of the anime, I was hoping he'd get Hinata in the club and she'd attract more guys, and even maybe get some other girls to consider it, as well, so long as Rei didn't... well, do exactly what he did. It could have been a supportive environment where others in the school could get introduced to the game and maybe even excel, if they could even absorb a fraction of Rei's skills.