I see what you're saying, Bob. And I know we're splitting hairs at this point, but I still think, technically, that that sentence doesn't necessarilly presume that the player has not stopped moving - it technically reads that the player either 1) hasn't stopped moving, or 2) has stopped, but for less than one full second. If it presumed what you say, it would simply read, "and has not established himself as a back by stopping."
I'm sure everyone is taking some valuable knowledge and insight away from this thread, at this point.
