Thanks to AJ for the heads up.
They released a few more spoilers, so I can share a bit about Horatio's injuries: he was hit by a bullet fragment after the bullet itself ricocheted off of something, and it sounds like the wound was a through-and-through. The doctor wants him under observation for 24 hours because he isn't out of the woods yet, but Horatio insists on leaving so they don't lose any time.
Natalia is recouperating nearby, and she seems concerned that Horatio isn't going to follow the doctor's orders.
Source: csifiles
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