Of course a heavy touch by Smith in CM caused the turnover, but you have to react and cover and Jones's work was sloppy.
1) He does the right thing to get goalside of Weimann but he's ball watching not man watching
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2) His body position and position in relation to Weimann is all wrong, and allows Weimann to turn inside him
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3) Now he struggles to close Weimann down
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4) He is late to block the pass, and Weimann immediately runs behind Jones. He really didn't have an opportunity to block it so should have marked the man, bad decision. Weimann's got the run on him, done him like a kipper
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5) Within 3 seconds they've gone from touching to 10 foot away because Jones got his body position wrong, which forced him to recover at the wrong angle and gave Weimann the jump on him
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I'm not trying to be overly critical of a young inexperienced player, just giving my summary of what went wrong, and Jones made two big mistakes when his initial field position was actually ok. I think it's more of a mistake than Smith losing it in their half. It's not the first time this season either, I could show others. I don't blame him for stokes goal, that was bad refing, but he's probably made big mistakes in 4 or 5 of the goals we've let in.