@McTag,
Don't forget that the swinging boot, which is lumpy, was making contact with a fast moving, lightweight ball approaching at maybe 40 mph along uneven ground and with a defender on your shirt.
Any one of the three great chances goes in the back of the net and United need 4 and all the back pages have to be re-written with Moyes on the scaffold.
Think of the money for the next round and the hopes thereafter. And that swinging boot is where it's at. If the lad was conscious of how many destinies were in play as he swung the boot it is understandable that he snatched at it.
Wilson of the Wizard would have nonchalantly turned it into the net out of reach of de Gea's despairing finger-tips.