20 WTF Moments From Sharknado: The 4th Awakens
2. Sharks Are Defibrillators (Duh)
Even once the Shepards are all freed from the sharks' stomachs, Fin is unresponsive and several attempts to resuscitate him have failed. In a desperate final measure, April connects the mysterious power source keeping her temporarily alive to two baby sharks, which she then slams onto Fin's chest, somehow functioning as a defibrillator, because Sharknado.
It works, of course, and Fin is brought back from the brink of death for a happily ever after ending with his entire family surrounding him. If you're looking for actual logic here, you're clearing watching the wrong movie, so just roll with it or change the channel.