Yuya's attention is so focused on Steven and the Rose Queen, he doesn't notice Joker until he's actively pulling him away. Yuya snaps his attention up to Joker, his expression flashing with irritation before he moves to jerk himself free.

He does take a few steps back, closer to Gongenzaka and to that extension the hole, but it's pointedly slow until he sees everyone else moving. He's sure he can cover the escape, but he's reluctant to go ahead and leave Steven to potentially sacrifice himself.