Sometimes a simple "I'm sorry you feel that way" or a " that must have bern difficult for you" are sufficient. Of course, you can validate without saying anything (difficult I know !). Nodding, looking directly at him and really listening works too.
I know it can be difficult to relax when you see them getting agitated.
3 kids BD 12/15/13 (IDKIILY. ) Rope dropped Cirque du Soleil style D final 9-9-14 "Some people are born on 3rd base and go through life thinking they hit a triple." Barry Switzer