Chikusa waits for approximately ten seconds just in case he hears the sounds of mayhem happening. When that does happen, he flops back on the floor of the restroom and sighs.

Dammit.

That is exactly how he spends the rest of his break before he has to go back to working, which he hates even on a good day, but none of his thoughts are really on what he's doing. It's when things are finally done with that he goes to search through the city for Ken.

He's feeling more than a little responsible for this. Which, coincidentally, he also hates.