10 minutes is not much time to leave and travel, but the location isn't far and coffee is not a time-consuming thing to obtain. By the time that Tachibana arrives, Isaka is already inside and waiting on an order for two cups of coffee to be poured and given over.

When the man enters, he'll turn his head and give him a neutral look. This is a serious matter. He cannot quite find a reason to be smiling.