Everything happens so quickly that there’s barely any time to react. All Chikusa can even manage is a quiet startled noise. By the time his body can react to so much as raise his hands- whether to grab a hold of Ken or shove him off, who can say- Ken is tearing off again and has left him up against a wall blinking.

Well. Maybe he’ll wear himself out running around. One can only hope.

In contrast, Chikusa is much slower as he makes his way to the bathhouse. In fact, he’s actually even slower than usual because of how worn out the day has made him. Whenever Ken gets there himself, he’ll likely find Chikusa propped up against a wall with his head bowed and possibly half asleep.
...And he’s probably only been there for like thirty seconds.