Explainer: Tua Tagovailoa, fencing response and NFL protocol

Tua Tagovailoa stumbled to the ground, his legs wobbly and unable to walk to the huddle after banging his head Sunday. The Dolphins said the third-year quarterback was conscious and had movement in all his extremities. Many former players were critical of the decision to allow Tagovailoa to return against Buffalo and start against Cincinnati.

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