What prevents A from "picking me off" (which I assume means "get to the top of the queue")? Also, "know to ignore the burst" doesn't mean you don't have to pro

What prevents A from "picking me off" (which I assume means "get to the top of the queue")? Also, "know to ignore the burst" doesn't mean you don't have to process it. It merely means you need to subtract the result of the burst from your signals.