Sanction can mean "give official permission or approval for (an action)" or conversely, "impose a penalty on."And then there's the word "left."
She left, so who's left?The first use means someone has gone away and is no longer there, but the second use asks who is still there.
Words can be slippery sometimes. To see more opposites in the same word, read 25 Words That Are Their Own Opposites and 75 Contronyms (Words with Contradictory Meanings).