Jeb and his sister-in-law were shocked and horrified. It clearly sucked the life out of Jeb. His countenance fell.

George is resigned to the reality of what he already knew or suspected. He was not shocked or surprised. His face and mannerisms said "Yep. Welcome to the party of what's really happening."

The more accomplished liars completely controlled their faces so their expressions didn't change at all. That's called a poker face. See Hillary and the Obamas. Especially Hillary.

Carter was puzzled he didn't have one. Jill was confused and looking for input from others.

Q said it was their promise to counter. But that could be anything, which is often the case with Q.