The Knockouts

When someone takes a blow to the head their brain rocks and hits your skull wall, that dazes you and knocks you out for a period of time, depending on how hard the blow or strick was. It takes the brain awhile to basically recover/restart and that's when you regain consciousness.
Remember, your brain controls everything and when you take an impact to the head it does what it has to do for you to survive, and sends millions of messages throughout the body and shuts you down.
Getting knockedout comes with the job.