The pain lessens, but the shock and blood loss keep the change from registering. The only thing that really sinks in is that David's going to find a healer, and that... he can't let that happen. They'll try and fix it; they'll ruin everything. Sacrifices don't mean anything if you take it back. He has to suffer so that God will be moved and protect the bus.

I appeal to you therefore, brothers, by the mercies of God, to present your bodies as a living sacrifice, holy and acceptable to God.

He can't let David get a healer. He can't. Jay pushes weakly at David to try to shake him off. "No, don't..."