"No...but we can find him!" Sora responded. He probably took a hit or two, but didn't pay much notice to it. But then, Roxas disappeared further into the deck.

Crashing after Roxas wouldn't do if they didn't know what direction he was going in...he could end up making a lot of noise only for Roxas to be behind him or above him the whole time.

So he followed Ven's lead, moving from one piece of cover to the next, searching hard for a sign of Roxas.