The difference is how nervous a ref gets stood in front of a screen, watching something out of context on a screen with a huge amount of adrenaline passing through his system, with every sub-conscious bias feeding into his decision making and 50,000 people staring at him and whistling.

It's like uts designed to create a decision based on flimsy momentary emotion. The opposite of a dispassionate technology based decision.

The reason he didn't give it in the first place is because the keeper launched himself at the ball. Should have just stuck with that.