""Mr. Walkabout" doesn't know what was happening as Hillary Clinton's hand went to her mouth"

Supposing that she wasn't in the process of witnessing something somewhat shocking involving the execution of an elderly man then Ms. Clinton's hand was no doubt either caught in the act of suppressing either a loud belch, or a guffaw, or maybe more sinisterly she was repressing her sudden embarrassment over discovering that a tiny fart which she had she had stealthily released (on the foolish assumption that it would be innocuously airy) possessed far greater noxious powers than she had formerly anticipated.. We may suppose from the expressions on the faces of her companions, that the latter may well have been the truth.