Nice!
I guess you're Red Shorts, and your friend is Black Shorts.
Tell Black Shorts that he doesn't need to pull up with his top hand during his swing. Better yet, practice that in the gym. Press/squeeze. There's no advantage to pulling with the top hand so early - it's a bad habit to get into. Even on these simple drills. Always think "technique/technique"! Like Tony Little on the ab machine commercials!
I like your swing there, Mr. Red Shorts, but I don't know why you feel the need to finish your vault. Especially the turn. You shouldn't be practicing that part of you vault on this simple drill, because it may cause you to turn too early on your regular vaults.
I never did sand vaulting, but I did lots of drills into a regular box/pit where I did straight poling like this. I didn't call them "short run vaults", I just called them "straight-pole warmups" - if they had a name at all. Just jogging like you, a few steps into the plant/jump. What I focussed on was the swing. The SWING - nothing after that!
Well, I did do a little back-flip into the pit, but that was just to finish my SWING.
Seriously, if you get a really fast SWING, with a WHIP at the bottom of the SWING, then your momentum is just going to draw you into a back fip - without hardly trying to add that. It just sorta "happens". Do it right, and you can do it in your straight-pole warmups. As it warms you up, it pysches you up in prep for your short runs. Then your long runs. Everything's a progression!
But don't even try it til you get the hang of it on the highbar!
Kirk