As the Democratic debate in Iowa wrapped Tuesday night, Sen. Elizabeth Warren confronted the extended hand of Sen. Bernie Sanders. He was plainly after one of those no hard feelings, good game handshakes. We’re cool, right?

Warren (D-Mass.) wasn’t cool. It’s hard to have the presence of mind to refuse the near-mandatory displays of collegiality, but she did, folding her hands. Noli me tangere. Touch me not. CNN had cut the sound by this time, but in the pantomime she seemed to be lecturing Sanders.