Baltimore Ravens quarterback Joe Flacco is in concussion protocol after taking a dirty hit from Miami Dolphins linebacker Kiko Alonso on Thursday Night Football.

Flacco was trying to reach the first-down marker on 3rd-and-10 in the second quarter, when he went sliding to the ground and then took a brutal hit to the head from Alonso. Flacco’s helmet went flying off, and he got up shocked and dazed. Ravens coach John Harbaugh was understandably furious and came out to yell at Alonso.

As CBS/NFL color commentator Tony Romo said, “This is not okay.”

Here’s another look at the hit and the chaos on the field that followed:

Alonso was given a 15-yard penalty, but was allowed to stay in the game, and that drew plenty of reaction on Twitter.

Even though Alonso was allowed to stay in this game, look for the NFL to issue a suspension for the linebacker.

Ryan Mallett is in at quarterback for the Ravens, who take a 20-0 lead into the second half.

UPDATE: Flacco officially has a concussion and also needed stitches to his ear that was left bloody after the hit.

[CBS/NFL Network]

About Matt Clapp

Matt is an editor at The Comeback. He attended Colorado State University, wishes he was Saved by the Bell's Zack Morris, and idolizes Larry David. And loves pizza and dogs because obviously.

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