Miller and Schenn are friends, which is likely why Schenn didn't lean into this one any harder and why he probably didn't put Miller through the glass. As you can see in the replay above, Schenn only takes 2 quick steps before gliding into the hit, instead of getting an extra stride or two off.
Regardless of whether or not he pulled up a bit because it was a friend and former teammate he was targeting, this is exactly what the Leafs brough Schenn in for - his intensity, his physicality and his leadership. It's only the regular season and he's already throwing the body around like this. Just imagine what he's going to look like for us in the postseason.