I told you guys in the gdt, this was a knockout where the principle point of contact was the chin. That makes a tremendous difference versus strikes to the temple. In a knockout situation, the impact briefly disrupts blood/oxygen flow to the parts of the brain responsible for consciousness, and is typically restored quickly. It was very textbook. A transient loss of consciousness for about a minute. The difference with concussions and more direct blows to the head is that those are more typically associated with inflammation/swelling. Those types of injuries are typically much scarier. This isn't a common injury in hockey obviously, but it is extremely common in MMA. They obviously scanned his head at the hospital and didn't see any bleeding or swelling, which offers further support to what I said earlier. Its very possible that he could still have a minor concussion, but I expect that he'll return to action much sooner than people think.