Yeh, it looks like Vader strikes the railing first and then the wall.
As for the rip in the arm of Luke's outfit, well it is there throughout the sequence. It's just the way that Luke's arm is positioned that makes it looked closed, but upon closer inspection you can see the rip and Luke's skin. (just click on the image for a larger view)
EDIT: Corellian77 beat me to it :)