Hawksbills seem kind if finicky.
We've had them come over and swim with us, within 2-3 feet of us, and other times they will just swim away. They are incredibly fast when they decide to get out of dodge.

Last summer we were in Christmas Cove and swam with a Hawksbill for a long time. Maybe 30 minutes or more. Got lots of pictures and video with the GoPro.