Dal Shabet

"Alright," Vincent agreed, and approached the slave. With his right hand, he grabbed her around the throat, and brought his other hand close to her head, near her ear. At one point, Amos noticed that the captain's index finger cracked and made some other unpleasant sound as it transformed into a thin, elongated tentacle, and immediately darted inside the woman's head. Her eyes rolled back, and, losing consciousness, she collapsed to the ground. "That's better. I never liked those things my subordinates do to prepare slaves for sale. Take your gear, and do it quickly, she'll come to in a minute."

Added 11 minutes later

Adrian swims towards the wreckage, remaining vigilant. He is primarily looking for Amalia's sword.

As expected, the sea abomination attacked precisely when Adrian, the intruder, got closer to the "Breeze," the creature's current home. Invisibility played no role, and Adrian could have become easy prey if he hadn't noticed the approaching enemy in time with his experienced eye.
[Basically, Adrian has 3 seconds to make a decision (in game terms)]