The set piece nonsense is a different story....Traore's cock up started it but it should've been ended in midfield.
In that passage of play Mings' focus was the crosser (a valid argument is why he didn't get closer, but I presume he thought Targett? would make the ground up quicker) so it falls on Konsa not getting tighter to challenge for me.
But it's one of those things, it's ten a penny in the game and like most things in football, it usually ends up in the stands. It wasn't a big enough cock up from any single player for blame...it's just one of those things.