I am a trampoline coach, and I recommend that tricks involving rotation over the head should be taught by a person with experience, and on a suitable trampoline to avoid injury.
People attempting dangerous tricks on their own are invariably the ones who get hurt, usually something broken from them having fallen off, or damaged spine or neck from having landed incorrectly.
For the record, in a seat drop, the hands should be facing forward to avoid snapping the elbows.