Yeah, it actually happens a lot in that third video CrazyTails posted. What happens is that if you are near an enemy, but not above them, the HA won't trigger (which is the correct way for it to work). Rather you'll do a usual air dash, but if you're near enough to the enemy you'll hit them in a moment of aerial spin attacking and the momentum of jumping forwards continues to the next enemy, and then to the next.
It's actually quite a cool reward for those who time it right. Considering it looks so cool and isn't game breaking, I'd call it less of a glitch and more of a 1337 move.
I have it happen quite a bit when I time it right, but it always happens to me in the second to last chain of enemies in CSZ act 3.
bopbopbopbopbop!