Having spent basically his whole life at sea, he has come across plenty of creatures. Sirens especially. Foul creatures who sing to sailors just to drag them into the water and kill them. Normally, Captain Jack wasn't affected by them, knowing how to combat them.
This time around, he didn't know why this one got to him. It was weird and different.
The sirens voice immediately caught his attention. He was standing at the ship's wheel, a rum bottle in hand and his compass in the other. His compass pointed to whatever the holder desired the most. Captain Jack was using it to guide him where to go next and it was pointing one way until he heard that voice.
Captain Jack watched the arrow on the compass turn to the voice of the siren. He turned his head to look at it too, falling into it's trance. Along with the rest of men.
Mentally cursing himself, he couldn't believe he was falling for its tricks.