If your partners are following basic gun safety on a quail hunt, they aren't going to wheel and fire outside their zone of fire, so them knowing you are 30 yards away isn't the critical issue. Just like any other kind of hunting, you don't run around in the field yelling at your partners. And, if your partners exercise basic safety, you don't have to. When you come up and rejoin the line, you want them to be aware of that because you are closer to the zone of fire.
Good night. And always keep your gun pointed in a safe direction.
A good lesson to remind all of our youth, and a good moment to teach it.