Simplify the following text for a Grade 9 native English-speaking person.
Original: After they have all gone below the ship to row , the Mariner walks out onto the deck and threatens to drop a flare into the oil reserves unless the Deacon releases Enola .
Simplified: The Mariner walks out onto the empty deck of the ship and threatens to throw a flare down into the oil holds unless the Deacon returns Enola .