I totally agree, he's stressed!
who wouldn't be!
Hes likly gone from never being handled and neglected, to being handled a lot, and your likely wanting to over care for him!

Not givin you a hard time, But over doing it won't help him. Which I'm sure you want to do.

All that said, he MAY have struck as a feeding response!
Smart phones run hot, especially near the battery pack, on iPhones there's a spot on the back right under the apple logo that gets toasty!
It's a spot about the size of a quarter...not much bigger that the head of...a rat or mouse...
You quickly moving the phone might have looked like food bouncing past!

I'm a novice myself here, so I can't really tell you if you should feed him immediatly or not, he does look thin to me...but it maybe better to let him settle a few days before feeding, better to wait a few days than feed him now and he regurgitate it from stress!

Can anyone with more experience comment on this?

Good luck on your snake journey!