Gongenzaka has no IDEA what all that is about-but he's careful to keep those on his person before he goes to get Yuuya (and therefore, Yuugo).

He'll keep his energy sense focused on Sans, and see about positioning himself and the others at the nearest balcony so they can be ready to intervene when the time is right.

also thanks for the small massage tool he supposes

Presumably, once they're in the shadows, Gongenzaka will be Properly Hidden in any case.