Bailly doesn't cover himself in glory either, as you point out.
You need to cut this "agenda" shit out, as well. I don't have one. I call it as I see it.
If the ball was played to the flank, Maguire has to respond. What he doesn't have to do is go out there, in anticipation, and leave his area of responsibility wide open, inviting the ball to be played there from deep.
If he stays on Lookman, he can cut it out/challenge as he receives/challenge after he controls it. Instead he puts out the welcome mat, by covering where the ball doesn't go, and is already covered by Shaw.
Three defenders cock up there. AWB's mistake is a split second one.
Maguire and Bailly's mistakes are poor decisions.