It might be if he was running in the same direction as the ball. In this case he started running after the ball and then went across the defender and in a different direction to its path. This, for me, shows he has created the collision.
Originally I thought it was never a yellow card. Having watched it again you can see Vardy runs across the defender, with the inevitable consequence that he goes down.
On a more positive note, that man from Argentina could become Leicester's hero!