you were the biological son of Bruce Wayne (or not, you pick) aka: BatMan. One day, while you were on a boat with them all when the boat had crashed into a rock and flipped over, luckily it was near dry land, but you… you were in the boats bedroom (or whatever they’re called), they had… abandoned you and had said “everyone’s out”… but you were still in there, you weren’t injured but the boat was sinking (the water is only 20 feet deep)