Great shot!! He got a lot of lift on the cue ball.
From the video it looks like he also had another option. Kicking three rails out of the corner where the seven was with extreme left spin and possibly kicking it into the top side pocket.
That's what I thought too but I know I would have screwed it up! I'm sure his way was the easiest way for him to hit the 2. I see a friend of mine do those rail hops all the time but I can never remember to try it when faced with a shot like that so I always try some crazy kick!