He may not be stressed from that particular experience, but he could be stressed out from his environment.
He has two non-identical hides. Hides are very important to ball pythons as they spend nearly all of their time in hides. You need two IDENTICAL and tight fitting hides. This means low to the ground and hugging the snake on all sides and with one small opening. Half log hides do not cut it. The hide should also be completely opaque. Place one hide on the hot side and one on the cool side.