At seven, sometimes soft, reassurance and openly noting his frustration can be helpful. He is at an age that can, sometimes, be reasoned with. If he settles enough, at that age, he has growing emphatic tendencies likely. Not that you want to share much, just explain you experience upset when he is upset. It is a difficult balancing act and such strategies can work, may work, be totally ignored, or interfered with by his parents or guardians. Best wishes and good luck.
The only other move I can think off is you will need use your coping skills and use radical acceptance knowing he won't, at least for now, change.
I can attest to having had success reasoning with kids that age when I worked as a TSS. Can't say it worked for my kids, but they all turned out as great adults; I probably mostly remember the tougher times with them as headstrong youngsters.
Wish you success.

thank you SO much for this and i have tried that but not the im upset when your upset and i will, yeah im going to do the five rule where you breath for five seconds and hen out i think thats what it is .
yeah thats my hope for Hunter so im tyring my best but yeah...