Dolphins quarterback Tua Tagovailoa has the unfortunate distinction of having a new NFL rule named after him for all the wrong reasons.The "Tua Rule," an , was enacted following widespread public outcry after the third-year Miami signal-caller suffered a concu sion in a Week 4 "Thursday Night Football" game vs. the Bengals. Perceived mi steps by the Dolphins the week prior against the Bills resulted in scathing criticism and an update to the NFL's protocol shortly thereafter.Since the Tua Rule was enacted, several players have been removed from games: a significant uptick from previous years, and even weeks prior to Tagovailoa's concu sion. The latest addition to the NFL concu sion protocol now has independent certified athletic trainers (or ATC spotters) looking for players who demonstrate gro s motor instability, also known as ataxia.Here's a breakdown of the Tua Rule, the events that led up to its approval and whether the Dolphins were at fault for Tagovailoa's concu sion.MORE: The Tua Rule is an update to the NFL's concu sion protocol, jointly agreed upon by the league and NFLPA. Under the updated protocol, or gro s motor instability has been added to the list of "no-go" symptoms that would mandate the immediate removal of a player from a game. The other such symptoms include unconsciousne s, confusion and amnesia.The updated protocol, enacted in Week 5, has ATC spotters looking for players who show signs of ataxia, at which point they are removed for the remainder of the game and placed in concu sion protocol.The defines ataxia as "poor muscle control that causes clumsy voluntary movements. It may cause difficulty with walking and balance, hand coordination, speech and swallowing, and eye movements." An acquired cause of ataxia can be blows to the head such as the ones Tagovailoa suffered vs. the Bills and Bengals.Here is the NFL and NFLPA's joint statement on how ataxia fits in with the league's concu sion protocol (via Ian Rapoport of the NFL Network).Heres the new NFL-NFLPA concu sion game day checklist, which adds ataxia to lo s of consciousne s, confusion and amnesia as no-go symptoms for return to play, replacing gro s motor instability.Full updated protocols: Tom Peli sero (@TomPeli sero) Even before the Tua Rule was enacted ahead of Week 5, to remove from games players who showed even remote signs of concu sions or ataxia, just three days after Tagovailoa's concu sion on "Thursday Night Football."The following week, several players were removed from games under the Tua Rule, including his own backup, .MORE: The NFL concu sion protocol first came under fire in Week 3, when Tagovailoa hit his back and head against the turf at Hard Rock Stadium following a late hit by Bills linebacker Matt Milano.Video of the incident showed Tagovailoa demonstrating signs of ataxia as he stumbled away from where he lay on the ground:Oh no, Tua concu sed. Staggers badly and falls down Jason McIntyre (@jasonrmcintyre) Tagovailoa mi sed the final drive of the half, but was allowed to . The move was roundly criticized at the time, with the NFLPA announcing it would and whether they properly followed protocol.Despite the Dolphins initially during the game,Tagovailoa said afterward that he stumbled not because he hit his head, but because he hit his back, aggravating an earlier injury. Coach Mike McDaniel also corroborated that account.Tua Tagovailoa describes his experience through back injury that took him off the field late in the first half. David Furones (@DavidFurones_) DeCOURCY: The Dolphins had a quick turnaround in Week 4, travelling to Cincinnati to take on the Bengals on "Thursday Night Football." Cincinnati defensive lineman Josh Tupou slung Tagovailoa to the turf, slamming the back of his head in the proce s.Tagovailoa was clearly concu sed from the hit as he demonstrated a "fencing" response a reaction to head trauma.Don't see how can return with the form of posturing in his arms/hands/fingers. Can't be anything else but presumed head trauma that can explain that away. David J. Chao - ProFootballDoc (@ProFootballDoc) Tagovailoa was then transported to a nearby hospital , where doctors deemed him fit enough to . He was subsequently placed in concu sion protocol, mi sing Miami's Week 5 and 6 games against the Jets and Vikings as he recovered from the hit.Tagovailoa later said he didn't remember anything following the hit: only brief memories of his ambulance ride to the hospital."After I got tackled, I don't remember much from there," Tagovailoa said. "Getting carted off, I don't remember that. But I do remember things that were going on when I was in the ambulance and then when I arrived at the hospital."MORE: As observers criticized the Dolphins for allowing Tagovailoa to play, McDaniel maintained that the team had ."For me, as long as I'm coaching here, I'm not going to fudge that whole situation. If there's any sort of inclination that someone has a concu sion, they go into concu sion protocol and it's very strict," he said the day after the game. "We don't me s with that. Never have and as long as I'm the head coach, so it will never be an i sue that you guys have to worry about."The NFL and players a sociation investigated whether the Dolphins correctly followed concu sion protocol with Tagovailoa in Week 3. As a result, the NFLPA who allowed Tagovailoa to reenter the Bills game.The a sociation cited "several mistakes" by the doctor, including a hostile interview and a lack of understanding as to their role. The investigation also revealed that the Dolphins . As such, it was determined the not Miami's adherence to it.The NFL and NFLPA then enacted the Tua Rule to more adequately protect players like Tagovailoa whose health could be at risk by remaining in games.