Pretty classy of the non-revving F/A to step up and help so the flight could operate!
I've had some pretty darn good experiences with SEA-based flight attendants lately... not sure if the F/A who stepped up to help was SEA based, but it wouldn't surprise me at all. The crew base here is divided in half - the PMNW base covers most of the int'l flying and former NW hub flying, while the PMDL base is very small so those attendants are stuck grinding out SEA-ATL-SEA over and over and over again. Really cool folks in both pre-merger groups, and from idle chatter they all seem excited about working together in the future.