Normally I'd say "anything that gets it done for you, and doesn't hurt others" but .. wow. Did all the videos demonstrating proper techniques vanish or somethin

Normally I'd say "anything that gets it done for you, and doesn't hurt others" but .. wow. Did all the videos demonstrating proper techniques vanish or something? Air pockets under the skin are freaky but as this says may not be a big deal. I got mine from playing trombone (the musical instrument).