In Karen culture you are to never ever and I mean ever walk in front of someone. That would be considered a serious breach of etiquette.
Imagine that you are entering a spacious room that you find a rather pressing need to pass through. Upon entering you observe an unassuming individual seated against the wall at the adjacent side of the room. You calmly observe this fact and at this point you will sedately make your way over to that individual and pleasantly request that they move forward before stepping behind their back.
You were just very polite and quite in-line with popular etiquette. If there is no plausible way to maneuver behind them, you will bend over, putting your hands together in front of you, before slinking past.