It looks like after Shazam taunts that for a brief moment the Billy model is still contained within his own model with an actual bit of collision detection. That means that if we attack shazam with an unblockable of any kind directly after his taunt we should always be able to recreate this so long as normal shazam jumps. Looked like the arrow's box connected with inner billy and pushed it out of Shazam . Dont know if this would work with any move but Arrow Super though as its a delayed unblockable and all others would likely hit Shazam instead.