Scary, late hit by Dolphins defender gives Joe Flacco a concussion and starts scuffle between both teams

The Miami Dolphins-Baltimore Ravens "Thursday Night Football" game turned ugly after Dolphins linebacker Kiko Alonso hit Joe Flacco with a late and seemingly dirty tackle.

In the second quarter, Flacco scrambled for a first down and slid as Dolphins defenders surrounded him. As Flacco hit the ground, Alonso launched at him, hitting Flacco's head with his shoulder.

Flacco immediately signaled for help from the sideline, clearly dazed, as Ravens defenders then went after Alonso, starting a brief scuffle.

Here's the hit:


Tony Romo criticized Alonso's hit after.

"Alonso way too aggressive," Romo said. "Quarterback's giving himself up, you need to at least show restraint at the end of that."

Ravens coach John Harbaugh was furious and got in Alonso's face as a referee got in between them.

Flacco was able to get up and leave the game on his own, but the Ravens later announced that he had sustained a concussion and was in concussion protocol.

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Kiko Alonso lays out Joe Flacco with brutal hit
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Kiko Alonso lays out Joe Flacco with brutal hit
BALTIMORE, MD - OCTOBER 26: Quarterback Joe Flacco #5 of the Baltimore Ravens is hit by middle linebacker Kiko Alonso #47 of the Miami Dolphins as he slides in the second quarter against the Miami Dolphins at M&T Bank Stadium on October 26, 2017 in Baltimore, Maryland. (Photo by Patrick Smith/Getty Images)
BALTIMORE, MD - OCTOBER 26: Quarterback Joe Flacco #5 of the Baltimore Ravens is hit by middle linebacker Kiko Alonso #47 of the Miami Dolphins as he slides in the second quarter against the Miami Dolphins at M&T Bank Stadium on October 26, 2017 in Baltimore, Maryland. (Photo by Patrick Smith/Getty Images)
BALTIMORE, MD - OCTOBER 26: Quarterback Joe Flacco #5 of the Baltimore Ravens is hit by middle linebacker Kiko Alonso #47 of the Miami Dolphins as he slides in the second quarter against the Miami Dolphins at M&T Bank Stadium on October 26, 2017 in Baltimore, Maryland. (Photo by Patrick Smith/Getty Images)
BALTIMORE, MD - OCTOBER 26: Quarterback Joe Flacco #5 of the Baltimore Ravens is hit by middle linebacker Kiko Alonso #47 of the Miami Dolphins as he slides in the second quarter against the Miami Dolphins at M&T Bank Stadium on October 26, 2017 in Baltimore, Maryland. (Photo by Patrick Smith/Getty Images)
BALTIMORE, MD - OCTOBER 26: Quarterback Joe Flacco #5 of the Baltimore Ravens is hit by middle linebacker Kiko Alonso #47 of the Miami Dolphins as he slides in the second quarter against the Miami Dolphins at M&T Bank Stadium on October 26, 2017 in Baltimore, Maryland. (Photo by Patrick Smith/Getty Images)
BALTIMORE, MD - OCTOBER 26: Quarterback Joe Flacco #5 of the Baltimore Ravens is tackled by middle linebacker Kiko Alonso #47 of the Miami Dolphins during the second quarter at M&T Bank Stadium on October 26, 2017 in Baltimore, Maryland. Flacco left the game after the hit. (Photo by Patrick Smith/Getty Images)
BALTIMORE, MD - OCTOBER 26: Quarterback Joe Flacco #5 of the Baltimore Ravens lays on the filed after being hit by middle linebacker Kiko Alonso #47 of the Miami Dolphins as he slides in the second quarter against the Miami Dolphins at M&T Bank Stadium on October 26, 2017 in Baltimore, Maryland. (Photo by Rob Carr/Getty Images)
BALTIMORE, MD - OCTOBER 26: Quarterback Joe Flacco #5 of the Baltimore Ravens is hit by middle linebacker Kiko Alonso #47 of the Miami Dolphins as he slides in the second quarter against the Miami Dolphins at M&T Bank Stadium on October 26, 2017 in Baltimore, Maryland. (Photo by Rob Carr/Getty Images)
Baltimore Ravens quarterback Joe Flacco is slow to get up after being hit by the Miami Dolphins' Kiko Alonso in the second quarter at M&T Bank Stadium in Baltimore on Thursday, Oct. 26, 2017. The Ravens won, 40-0. (Lloyd Fox/Baltimore Sun/TNS via Getty Images)
Baltimore Ravens quarterback Joe Flacco is slow to get up after being hit by the Miami Dolphins' Kiko Alonso in the second quarter at M&T Bank Stadium in Baltimore on Thursday, Oct. 26, 2017. The Ravens won, 40-0. (Lloyd Fox/Baltimore Sun/TNS via Getty Images)
BALTIMORE, MD - OCTOBER 26: Quarterback Joe Flacco #5 of the Baltimore Ravens walks off after being tackled by middle linebacker Kiko Alonso #47 of the Miami Dolphins during the second quarter t M&T Bank Stadium on October 26, 2017 in Baltimore, Maryland. (Photo by Patrick Smith/Getty Images)
Baltimore Ravens quarterback Joe Flacco (5) is slow to get up after he was hit by the Miami Dolphins' Kiko Alonso in the second quarter at M&T Bank Stadium in Baltimore on Thursday, Oct. 26, 2017. (Kenneth K. Lam/Baltimore Sun/TNS via Getty Images)
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According to ESPN, NFL rules state that defenders must pull up from their tackle as soon as a runner begins to slide feet first. If a defender has committed himself, it is not an illegal hit unless they make forcible contact with the head or neck area of the runner.

This is the second time this season that a Thursday NFL game has been marred by a scary hit. Though Alonso's hit on Flacco didn't appear as gruesome as Danny Trevathan's hit on Davante Adams, it nonetheless was a frightening scene that serves to remind the risk of playing football.

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