I've taken these quotes out of the Petrovic thread to continue this in here. I've just been looking at the different players for the goal in the video below.
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As Watson comes in from his 1st touch, Choudhury looks to his left (as Watson comes at him) and sees there is a covering player central to cover his left (Vini Souza). Choudhury's now thinking about covering Watson coming at him or possibly going to his right. He pushes his weight onto his right foot with his left foot to go to the right if Watson knocks it that way but this is milliseconds after Watson knocks it left so Choudhury is not able to react quick enough to go to his left instead and Vini Souza is also in the way. Not much he could have done to stop it.
Vini Souza is about 13 yards away from Watson's 1st touch and 10 yards from the 2nd. He trots across centrally and ends up dropping 3 yards deeper also to cover the centre. Bear in mind he's also got Roberts coming towards him. It's clear he's knackered so he's doing the basics and playing it safe. He wouldn't have got near that shot unless he risked staying further out when faced with Watson with the ball and Roberts. However there's no way he knew where the ball would be after Watson's 2nd touch knocked the ball forward another 6 yards. It's easy to look back with hindsight to what he could have done but this happens but real time at speed, impossible to predict.
Tom Davies #22 who slides in to block Watson, had just come on in the 90th minute. His error was he didn't react quick enough. He got the ball off Roberts but then ball watches even after Moore gave the ball away. You can see Roberts is still running and reacts quicker to the Moore's error. Davies finally reacts and comes flying in but it's too late. If he'd tracked Roberts sooner then he would have probably blocked Watson's attempt so has to accept some blame.
The last line of defence, the keeper which is mainly what the discussion was about, is leaning to his right to see past Vini Souza so leaving his left side open. He's also bouncing and jumps just before Watson shoots so he's in the air when the ball is hit and it's travelled at least 6 yards by the time he lands, past Vini Souza. His body weight is all wrong also to push off to the left so he doesn't get across as quick on his dive.
He didn't need that last bounce at all and you can see this clearly at 1:55 in the video . I've slowed the gif down and it pauses when the keeper is on the deck just as Watson is starting his swing shot, when the keeper jumps, when he's off the deck yet the shot has travelled yards, when he lands and then finally dives. I agree with
@nowtgoodeverhappens and
@AC Mack as better footwork may well have meant a fingertip save given the ball was. That's why many have commented at the time not believing it was going in and seemed slow but it's down to the precision of the shot and the delay in the keeper's reaction and weak dive that makes it look that way. Had he not jumped prior to the shot, he would have dived earlier and possibly farther across and would have saved it.
Anyway that's the Sheff Utd players out of the way. For Watson and his 2nd touch, watch the angle from 6 mins but change the speed to 0.25 times so you can see it better. At his 1st touch you see Watson briefly look up directly at Vini Souza and he still has him in his view as he goes forward. He looks down at the ball for his 2nd touch and watch how his eyes only follow the ball never looking anywhere else. He takes another 5 strides after that 2nd touch and then a 6th stride with his right foot shot so he's shooting completely blind at this point. That's because he knew exactly what he was doing before that 2nd touch, which is to knock it inside and curl it in bottom right around Vini Souza using his a block of the keeper's view.
You also see Choudury looking to his left and his weight shift at 6:58, along with the keeper clearly off the deck. I've gif'd it and again paused when the keeper is on the deck, then in the air after bouncing. I should pay
@10 Trenches Deep to put my words into video sometimes as the close up angles are class for better analysis of what went on.