Maybe he didn't want the help! (He did, and he absolutely needed it; his pride won't let him admit it aloud to anyone at all).

Jiang Cheng regards him for a moment, thoughtful. He has no experience with teleportation in this sense; sword flight is a much more familiar method. But he does have some experience with not being able to control a new power, which he can only assume this is. He was given empathy: Tidus teleportation.

"How have you tried to stop the teleportation? What do you do?"

He's not necessarily going to be helpful, but it doesn't hurt to try.