Maybe, the body language and facial expression don’t appear like the reason imo.
Shrug.
I haven't paid attention, but because Britain is steeped in bizarre tradition so deep that you need an ice drill to get through it, the Royal family was trained to supress emotional expression in public. I'd go more on the body-language. It's a bit different for those brothers because of their mother. The whole country wept when she passed.
Don't look to closely though. Wouldn't want Eagler to get grumpy again. He was 16th in line for the throne, but after this outburst...