[ The technology of her time isn't quite up to par with Thesa or what Jim is familiar with, but his explanation lays it all out well enough for her. That, and being a part of the Strategic Scientific Reserve and Howard Stark's friend — simply put, pulling the plug on a machine rather than following the correct sequence to shut it down. Low-power mode makes her wonder if the Natha's goal wasn't to shut the station down entirely but rather to let it run on the bare minimum to avoid... what, detection? It would make sense.

London was in a blackout during the Blitz. A brownout in the later parts of the war, with heavy light discipline so the Germans couldn't find their targets when they came to bomb the city. She's about to say as much when the lights in this room abruptly shift; that, along with the commotion at the door, kicks Peggy's reflexes into gear and she stands as quickly as Jim does — and immediately regrets it when her left leg flares in pain and half-buckles under the sudden weight. ]

Bloody hell, [ she hisses, one hand flying out to grip the edge of the table. She sucks in a breath and levels a glare at the door as the food and drink are brought in, passing off her reaction as indignation at the intrusion and light show rather than anything more severe. ] I wish you'd taken my recommendations into consideration, Mister Kirk. I don't think I care for the ambience of this particular establishment.