To state the bleedin' obvious: the reason Mascher made far fewer tackles from behind than Lucas does is that Mascher didn't let opponents get ahead of him as often as Lucas does. Players go past Lucas, and then he's chasing them towards his own goal, and he resorts to a push or a foot hooked around the ankle. Obviously he's not entirely to blame for being in that position - someone else's error has led to it - but there's plenty of opportunity for him to anticipate more sharply and be onthe front foot (and when he does so he's excellent at it). And he's got to realise that, when an opponent DOES go past him, it's either down to the back four to deal with it, or him to catch up and usher the opponent away from the danger area. As I said, he does loads of things very, very well, but it's as if he turns into a naive kid when he has to chase an opponent.