Liverpools Quick Free Kick

"blew whistle for FK so had to caution Sagna before re-start"
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We will never know what would have happened if the ref had not blown. In terms of the laws of the game it's not necessary to stop play just to caution becoz the ref can play advantage then caution a player when play stops unless the card is red which must be issued immediately. But Arsenal have also been denied advantage in some matches, not to mention the awful ref decision vs Villa. So I no longer bother to sympathise with teams that feel aggrieved by ref decisions.

I personally think the ref should've let the free kick be taken quickly, but virtually all of the Arsenal players stopped straight away when they realised the ref was pulling the play back, and as one fan said, the ball went very close to Sczez who would have stopped it.

In terms of the laws of the game it's not necessary to stop play just to caution
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Actually as soon as the ref blew for a freekick, with the intention of booking Sagna, the freekick cannot be taken until the player is cautioned.

Quick freekicks can only be taken if there is no booking involved.

This is just another way of telling themselves they were robbed.

Ollie
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You are spot on mate. Law 5 says:

"If the offence warrants a caution, it must be issued at the next stoppage. However, unless there is a clear advantage, it is recommended that the referee
stops play and cautions the player immediately."

As there was no advantage to Suarez, the ref was right to stop play and caution Sagna, and the goal was rightly chalked off.

In the spirit of the game, the ref should have let them play on because what Sagna did was practically cheating.

But the ref stopped play and thus had to book Sagna by the letter of the law. There was no advantage to play because when Suarez went down he controlled the ball with his hand, meaning any possibility of the ref playing advantage was gone.

Ref got it right.

In fact the ref was lenient as he blew his whistle at least 2 or 3 times and they didn't stop play but he didn't take any action for it.

How many times over the years have we had yellow cards for less than that and s red card comes to mind for shooting a immediately after the whistle was blown.

Yeah, I don't see anything wrong with the decision myself. Refs are under no obligation to allow quick free-kicks anyway - they're perfectly free to never allow a free kick to be taken until they've blown a second time if they want. Of course it's a rare referee that you'll see doing that these days, but by the letter of the law it's fine.

In the spirit of the game, the ref should have let them play on because what Sagna did was practically cheating.
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It is cheating, hence he got booked. Any foul is cheating as you go outside the laws of the game in an attempt to gain an advantage.q

In terms of the laws of the game it's not necessary to stop play just to caution
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Actually as soon as the ref blew for a freekick, with the intention of booking Sagna, the freekick cannot be taken until the player is cautioned.

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Exactly. It doesn't really matter what anyone's personal views are, the ref has to follow the laws of the game, which he did.