What Trump was doing was conscious measured breathing. He was deliberately keeping himself calm with a breathing technique. As Scott Adams pointed out, the Rats branded him as scary. Remember these are people who 1. Vote and 2. Literally need and use “safe spaces” filled with crayons and dolls. So Trump had to present himself as calmly as possible.
Hillary, on the other hand, came out as mocking, gloating and irritating as she could be (within her automated, catheterized drug dosage allowances, while listening to her earpiece and reading her notes of the questions), in order to try to trigger him into irritation.
She failed - and the Rats know it. Dean is just trying to succeed on the same tactic post-debate.
Clinton was laughing yucking it up and not serious.
Reminded me when Obama did an interview early on in his first term. He was laughing and the question was about the financial meltdown and Steve Croft was taken aback by Obamas cavalier attitude and Kroft asked Obama if he was “Punch drunK.