That's cool.
I believe he's using the bottle opener notch as a 'wave'.
You draw it, blade side against the corner of your pocket. As you draw it up, the notch will catch and pull the blade open. Takes a bit of practice, but once you get it, it's cool
I have a Rajah II, which is folding saw sized and it just makes me chuckle how well the wave feature will just snap that giant blade out on a draw.
Have to actually be careful a bit so you don't inadvertently wind up with a partially deployed blade and not realize it.