In my view Mbemba was trying to get more leverage by using his arms to jump, as you do, and his arm stayed up. His head then turned in the direction of Fellaini then next minute the ball hits him on the hand.
Never a penalty in a million years!
I just wanted to express my sympathies and condolences. Pav was the goalkeeper we had between the sticks when I was growing up and first supported the Toon!
RIP Pav.