This is not a WUM post, I didnt see the game but have just read the post below, was it the big game getting to him or has he had this for a while?
I think some people are naturally disposed to tremors in their hands, Those tremors are natural and get worse with age, adrenaline, stress and anxiety. So an old man with a history of high adrenaline responses watching his team get well beaten is likely to have a shake or two.