I agree that its low percentage for the player that doesn't practice these kinds of shots, but IMO, his his eventual break ball was lower percentage to get him much further.
Positioning teh break ball - or controlling the speed of that first ball is harder than the combination. The object ball was about 4 inches from the hole.
Combinations are a strong point in my game. I didn't start out that way - but one day I got tired of missing them. Today, I could spend hours shooting off-angle combinations, or just tapping the stack in an attempt to look for/create dead balls. If you spent an entire day once a week practicing these types of shots, you'd learn a new way to get out of a bad situation - and you'd view it as a tool instead of an eventual miss.
In this video, he'd run 26 balls, he had a BB with the 5, no real easy key ball - I figure at 26 balls, what did he have to lose by going for something like that... even if he missed he'd be giving himself a chance. If he was playing a serious match against Lipsky or Harriman, of course he should do what did in the video. I just gave him something to think about and to work on. I am not recommending it for competition.
As far as making a video that contains these types of shots - I put together a video of about 20 different shots that are similar to this. All I need to do is edit a little bit of it and post it.