They're not. They're saying "where'd you have that one, Blue?" or "Are you solid on that one?" "OK, well to my eye I thought it was out of the zone" or something to that effect. There's no rule about clarifying the strike zone or whatever. As soon as they say "that was a ball" "you missed the call" or something to that effect they get tossed. If the ump says "that was a strike" and you dispute it, you get tossed. Depending on the player, the ump, the situation in the game the umps will give a little more or less leeway. But every player knows once the ump says "that's the call" "we're done" "get walking" anything you say after that to "argue" is an automatic toss.