Can inumaki control who his speech affects?

So during the fight with hanami (between the students) when inumaki, megumi, and Kamo were running away from hanami, inumaki would yell “stop” so that Megumi and kamo could attack.. but I realized that him yelling ”stop” didn’t also make his friends stop, meaning he can control it? If he can then why doesn’t he talk normally and just control it so that it doesn’t affect anyone?