During Thursday night's Athletics-Angels game (OAK 5, LAA 4), L.A. infielder Jefry Marte lost his grip on the bat, and his bat struck plate umpire Paul Emmel in the head. Here's footage:

As you saw above, the blow drew blood and Emmel was forced to leave the game. This image tells the story:

Fortunately, it sounds like he's going to be fine:

Just saw the home plate ump Paul Emmel he's up & doing well after getting hit in the head, he's now on his way 2 the hospital 2 get stitches — Alex Curry (@Alex_Curry) June 24, 2016

Protective equipment makes such injuries far less likely, especially these days, but flying bats are dangerous no matter what you're wearing. Thankfully, Emmel seems to have avoided serious injury.