Herby
How could Blake have known?
Maybe to rest his D which had been out there for awhile down the stretch
You give Mahomes an extra down if you score and let him know exactly what he needs to beat you. You also give KC the option to go for 2 if SF had gotten a touchdown and KC answered, which they may have done because it goes to sudden death after that.
The rules are pretty similar to college other than where you start, I’ve never once seen a college team take the ball first.