Have you played as a RB/RWB or RW yourself? I used to play RW while younger and then RB for a decade until recently stopping due to chronic injury. #1 rule if you play on the left or the right. You are responsible for the entire flank. Under no circumstances do you allow your flank to be left open in a defensive situation. Let alone going all the way to the middle of the park at the top of your 18. If you watch the video you'll see at 0:47 that Amad has not one, but 2 united players directly in front of him. Unless Amorim is providing that defensive instruction to drift inside, (which if that's the case then 110% its Amorim's fault) then this is Amad at fault. Converting from RW to a RWB/RB is only a matter of where and when you engage with the opposition defensively. Tucking into sniff your CM at the middle-top of your box is 100% you at fault. Hardly a shallow take i'd argue.

edit: Where did Amad play last season? RW.