As the others begin to wander off, so too does Baku, opting to remain near the flank of the group. Not that he had a lack of faith in Mirai's abilities, but if he was anywhere near as new to this as Baku was, there's no telling what would happen if an enemy managed to catch the group unaware. The bulk of the teen's attention remains on what lies behind them rather than before them.

Wonder how the others got roped into this, but it's probably not a good time to ask.