A lot of it, and they mentioned it during the game was Hartline actually coming back to the ball and cutting off any chance the CB had at jumping the route. That was part of the reason for Tanny's first INT against Houston; don't get me wrong, it wasn't a great throw but Legadu was kind of nonchalant in his cut.
Another thing is something that has killed our D for a few years is the cushion. When you don't want to get beat deep you give a huge cushion, if that's the case you just run comeback routes every play.
And finally, Hartline has always been very decent at getting himself a little space between the defender. It's why some of the sideline passes over a defender are completed; Hartline gets enough space where the defender can't break up the pass
Another thing is something that has killed our D for a few years is the cushion. When you don't want to get beat deep you give a huge cushion, if that's the case you just run comeback routes every play.
And finally, Hartline has always been very decent at getting himself a little space between the defender. It's why some of the sideline passes over a defender are completed; Hartline gets enough space where the defender can't break up the pass