It's not really asking, it's his tactical duty. When you press to force a long ball from the back you go fullback to fullback.
It is up to Pogba and the CB on his side to deal with that long ball. If Matic was there he would have been tight to Eriksen and cut off the cross. Pogba made up for that blunder and was fantastic for the rest of the game though.
I thought Young was very poor this game. Was really poor in dealing with the press of Spurs and resorted to long balls far too often when better positioning, anticipation and usage of his left foot would have helped massively.