Burkhead almost certainly has a torn ACL for them to declare him out that quickly. There’s a couple of physical maneuvers that can be done in a couple of seconds that diagnose torn ACLs very accurately without an MRI. Damn.
No offense, but he's only missed one other extra point all season before this game and 3 field goals all season, including a perfect 4/4 from 50+. Hardly constitutes "done".