Yup, I agree. He probably wanted to make sure he wouldn't fall. These snakes aren't very coordinated, and don't like heights much, so they'll hold fast when you have them just in your hands. That's why I like to hold my bigger ones closer to my chest or lap; yes they like to slither around my neck (or waist), but at least they don't grab on too tight.

Oh, and bigger snakes = tighter holds. It seemed really tight to you, but it wasn't much for him. Believe me, you'd know if he was trying to squeeze you.