It's pretty clear, at least from this seat, that Luis Castillo is having a cascade problem running up and down his leg. It's been his hip flexor, hamstring and quad in quick succession. Castillo's had some structural problems in the past and I'm getting conflicting messages on whether the latest problems could be related to them. In any case, he seems to be taxed by explosive, quick movements, even in straight lines. A rest or even a DL stint could help heal it, but this is reaching the chronic stage quickly. That would leave Castillo as a speedy player without the ability to play speedy.