I think while she does scream here, her mike was already cut. The performance where we really hear her is Memphis Tennessee and I think that's where Chuck's reaction is from.
it's a rough point in the man's life. he's hit highs few can dream of, fuck... he just wanted to play with Lennon and 'yeah sure bring your wife I don't care" dude just wanted to jam....
then this happens. I don't blame him for the expression. Notice John's stone face at the same moment.