Gyousou's contribution to the initial ambush - or desertion, really - is to grin and make a slight shooing motion when Taiki looks back. The kirin looks surprised, but simultaneously resigned; there has been some forethought put into this outing, apparently.

"We can excuse some sloppy planning, in this case." And he's sure it's sloppy, from the expressions on Tidus and Taiki's faces. He reaches for his share of the containers, and balances them in one arm. "Since I have no complaints with the outcome. Roland, isn't it?"