I agree that defenders do it all the time and rarely get penalised (whichgreatly annoys me) but it's still a foul and if you do it in the box leading to a goal it will get penalised every time.
That's absolutely not true. It's a hefty shove in the back that pushes him under the ball that he would have won. I saw it in real-time and it's a foul all day long.
Fulham outplayed for the first 30 minutes so Leno gets an injury. Flexing his shoulder and wincing but then decides it's a hamstring problem. 10 Fulham players gathered round Silva for a tactical adjustment as Leno undergoes stretching exercises with the physio. After the tactical instructions...