In Pirates of the Caribbean: The Curse of the Black Pearl, Jack dives into the water to save Elizabeth, and cuts off her corset, which was preventing her from breathing. However, when Norrington and Governor Swann arrive, they immediately treat Jack as a threat.
The scene starts at 1:28:
Jack: Move! [shoves him aside, cuts open corset and Elizabeth spits out water and gasps for breath]
Mullroy: Never would've thought of that.
Jack: Clearly you've never been to Singapore . [sees medallion, to Elizabeth ] Where did you get that?
Norrington: [to Jack, pointing his sword at him] On your feet.
Governor Swann: [helps Elizabeth up] Elizabeth . Are you alright?
Elizabeth: Yes, I'm fine.
Governor Swann: [sees Murtogg holding Elizabeth 's corset; Murtogg points at Jack; Swann looks over at Jack ] Shoot him!
Elizabeth: Father! Commodore, do you really intend to kill my rescuer?
Norrington: I believe thanks are in order. [offers his hand to shake; reveals "P" for pirate] Had a brush with the East India Trading company, did we, pirate?
Governor Swann: Hang him.
Norrington: Keep your guns on him, men. Gillette, fetch some irons. [sees tattoo of a sparrow in flight] Well, well. Jack Sparrow, isn't it?
Jack: Captain Jack Sparrow, if you please, sir.
Norrington: Well, I don't see your ship, Captain.
Jack: I'm in the market as it were.
Murtogg: He said he'd come to commandeer one.
Mullroy: Told ya he was telling the truth. These are his, sir. [hands him Jack's effects]
Norrington: No additional shots nor powder. A compass that doesn't point north. [unsheathes sword] And I half expected it to be made of wood. You are without doubt the worst pirate I've ever heard of.
Jack: But you have heard of me. [is pulled along to be put in chains]
Why is Governor Swann immediately hostile? Did they not witness Jack save her life? Are they reacting based on Jack's appearance or the fact that he's holding the medallion or tore her corset?