Killian had always been able to read people fairly well. Jack was tip toeing around, perhaps afraid to step on his toes when it came to Isabela. Even if he had known just what Jack was thinking, he wouldn't have been worried. He knew that Jack had not been to visit the Siren's Call lately. And perhaps the one thing that made his and Isabela's partnership, however that partnership was turning out, was that Killian accepted Isabela's nature and didn't try to change it.
"Isabela is not the kind of woman you take for granted anyway, mate. She'd gut a man before allowing him to do that." Hook took a swallow of rum before continuing. "She may be free with her body but not with herself." There was a difference and Killian had the privilege of having Isabela share who she was with him. "Did you know Elizabeth well?"