Okay, maybe don't panic but we've been remarkably lucky on the injury front so far, so any time the dreaded "black jersey" is spotted the nervous sweats are going to commence.
UPDATE: From his post practice post:
Nick Saban won't address Kirkpatrick's exact ailment until tomorrow, but it didn't appear serious. Kirkpatrick was moving fine. He just wasn't participating in drills. From what I gathered, I'd expect him back soon.
Guess we'll have to wait until tomorrow to find out what's wrong, but hopefully it's as insignificant as it sounds.