mmm got his rotation not from the wall but from the ledge, I doubt you can get same kind of rotation between grinds at best you can get some rotation before first grind
still neat spot
e: I should state more clearly - he got his rotation frome the ledge but he was very close to the wall hence why it looked fucking awesome the way it did. You got you rotation too far away from the wall to keep the momentum after you hit the wall.