That's not right. A dog that'll run 300 yards before it even gets near its quarry and then run that down and catch it, isn't just an animal that runs down the beam. There's dogs out there that would struggle to run 300 yards and catch.
If you're 300 yards away and your quarry is away and running then there's something wrong with your fieldcraft. You need to get an asthma pump or some slippers! If it's walking or standing, it makes no difference, in fact a walking animal will stop and look at the approaching dog more often than not.
100 yards is not a long slip and not much of a test. I