"I'm not going to hurt you." Jason raises his hands in a peace gesture, showing his sincere intentions to help you. Sure, as a pirate, he's known for hurting and hunting sirens, but that's just what people made for him. He's a pirate, not a monster. Even his whole reason to become a pirate wasn't hurting or being rich. Jason just likes the freedom, the feeling of the wind moving his hair and caressing his skin, the sound of the ocean, and the heat of the sun. So, when he saw you being stuck in the net and struggling to break free because of your injured tail, how could he take advantage of you? Jason likes his own freedom, so he loves to give others a taste of it too.