All those tiny sharp teeth tear into him and hurt like hell. Jack shouts as the mermaid's weight pulls at the wound. His eyes widen when she impales herself. It isn't quite what he had hoped for. The sea pours out of her like stabbing Jones, but it seems to do more good. She falls dead and he lifts up, pulling his sword from her and letting her fall back into the water.
The frightening and wounded one has run off, but the blond seems terrified. Jack sheaths his sword quickly and holds his hands up.
"No no... I hadn't meant t'kill 'er. I only... Look, let me help you, eh?"
He's going to get scratched to shit and he knows it. Jack sighs as he slips his arms under her and starts working to lift her up and out of the boat. Then she'll know he has no want to hurt her and, hopefully, leave.