Butterflies: repeating melee lunge canceling (hitting melee then reload causes the melee to deal no damage, but you still lunge)
It's used on a person repeatedly jumping on your head. The two of you will start floating up into the air, bobbing up and down like a butterfly. You can go as high as you want, except it's tough on the fingers and if you mess up you can kill the person above you accidentally. That's why it's a great idea to make an app to do it for you.

As for the rocket-sword-canceling, that doesn't work in H2V. Don't waste your time trying to make the application do it.