RateTheRef

Looking again don't think it was a head injury

If a player is injured in the PA should the referee stop the game, what would be the guidance?

Down the other end if that was Lascelles fouling Salah they would have given a penalty

So Newcastle should've had a penalty?

Super performance from Mike Dean… all cautions correct and his decision to allow the equaliser from Liverpool was the correct one…

A referee could be put into an impossible position here. 

If the referee is forced to stop play for everything that appears to be a head injury then it is a short jump to a situation whereby players will fake a head injury when their team is in peril.

Conversely, if the referee chooses to let play continue and the player does have a head injury, he/she will be pilloried.

Once again the powers that be have placed referees in a no-win situation.

Totally agree, however, your last sentence should read "Once again the powers that be, aided and abetted by many players have placed referees in a no-win situation."

The goal was more certainly correctly allowed, but unlike the Manchester United goal were De Gea went down, there was definitely an opportunity to pause the game here before Liverpool were in a goalscoring position.

Ultimately, these situations are impossible to legislate for satisfactorily. Fortunately, there wasn't a serious injury here, but it's well within the realms of possibility that it could have been (this being an example where an injury can occur, despite the situation not being in the 'obvious' category).  Strangely, the player who hit the ground harder was the defender who got back to his feet - and that landing did not look pleasant.  Equally, it would have been interesting to see the wider view if both defenders had stayed down.

I don't envy Dean's position, and ultimately there was nothing he could do once play continued.

His positioning for the 3rd Liverpool goal, however, would be highly inadvisable for an official at any level.  It's a great clip for discussion on decision making and positioning.  That nothing happened here is down to sheer luck rather than by design.  Dean could have easily been skelped with the ball, or there could have been a handball decision on the Newcastle defender.  In the latter event he would not have been able to make a decision.

His position was almost borderline blocking the Newcastle defender(s) ability to play the ball. 

Obviously VAR would have been available, but that would not be a recourse available at lower levels.  An excellent clip to help with education of less experienced officials.

Clip is at 2:29, the later angles really show how awkward this was.

His positioning for the 3rd Liverpool goal, however, would be highly inadvisable for an official at any level.  It's a great clip for discussion on decision making and positioning.  That nothing happened here is down to sheer luck rather than by design.  Dean could have easily been skelped with the ball, or there could have been a handball decision on the Newcastle defender.  In the latter event he would not have been able to make a decision.

His position was almost borderline blocking the Newcastle defender(s) ability to play the ball.

He has also run across the line of the goalkeeper's view which wouldn't have endeared him to Martin Dúbravka.  He wouldn't have saved it anyway but it's just something else for a player to complain about.

Eddie Howe has claimed the player was dazed until after the match, which raises a question why do Newcastle not take player safety seriously

Indeed very irresponsible for him not to substitute him if that is the case. Howe to me anyway generally comes across as a very sensible and fair minded person so perhaps he wasn't aware until after the fact but it does raise questions about whether everything was done by Newcastle to ensure the players safety.