The slider was clean but....

You move off the wall like that NOT because the car was pulling hard left, but because you know the car you just slid is crossing over and coming under you.

Sammy came down the front straight the previous 2 laps and stayed right on the fence..he moved left to block that time.

Stenhouse was visible beside him early in the straight, then just when Sammys momentum carried him a little ahead he chopped him, plain and simple.

i doubt if he "Intentionally" knocked Rickys front end out but he "Intentionally" chopped down on him.

And yes, they are hard to drive...I know because I have done it about 35 times (a few of which were successful, haha)...but they don't tend to jerk left in the middle of the straightaway...when they wing over they drive off the left rear which makes the car want to pull to the right.