1. After somehow getting someone up in the air, you then jump up and use both knees to spike them into the ground. These attacks that reference a burst of speed to suddenly appear somewhere are always super awkward to me. No questions tho.
2. Similar to the last one, except you just use the burst of speed to get behind the enemy before delivering a strong kick. This one is much more useful as you could use it to avoid some cqc attacks. No questions.
3. This is a pretty baller maneuver, but more or less impossible to pull off, as you suggested. Jump at your opponent, grab their arms, slam both feet into their stomach to get them off the ground, and then essentially do a backflip while still gripping them to slam their head and shoulders into the ground. After that just jump off em and do a style backflip. You'd need a very strong defensive jutsu protecting you to ever attempt this lol. No questions.