OK, so, a few things about points in water blinds, first.
1. Some call them a factor, but they are really a hazard.
2. If you are using birds in training, or are running a trial, points will be scented. Some by design, but always because dogs returning with birds will scent them
on their return as they cross the point.
3. Any appreciable amount of wind will make re-entry off a point more difficult.
4. There is almost always some distance beyond the point, just after re-entry, where the dog will be out of sight of the handler. Even if the dog takes a perfect 'back' cast.
A successful over cast takes that out of play.
5. If the Swim By drill was a panacea for honesty in taking a back cast off a point in a water blind, we wouldn't be having this discussion.
A few 'Dog' things related to points:
1. Dogs have legs and feet, not fins. Water will always influence their responses, so consistency in how we handle around points is important in order to get good results.
2. Observe your dog closely when it lands on the point:
-how is the dog performing on the blind up to the point? Watery? Cheaty? Showing good balance/responses?
-is it sitting straight, or leaning one way or the other?
-is it obviously sniffing scent? What are you going to do about it?
-did it shake out it's coat? (this is not good!) If so, the dog is telling you it thinks the water portion of the blind is over. What are you going to do about it?
If you have reached the point and the dog is on it, within the area it should be, you have had at least some success so far on this blind. All that goes out the window without a successful re-entry. This is probably the easiest place to lose your dog on a water blind and fail the test or trial. If in a trial, remember that no one ever won a trial after the water blind. A good blind in a trial earns you the chance to excel on the water marks. If in a Hunt Test, well, no one wins a Hunt Test. But you sure can lose one if your dog gets out of control on a water blind.
So, why not get an 'over' into the water off the point, where you can see the dog, then give a 'back' cast to get back on line and finish the blind with style?
Contrast this with what may happen if you either let the dog roll, or give a back cast off the point and the dog hits the water and starts down the back side of the point, out of sight.
-you can't see it and don't know exactly where it is.
-when you blow the whistle, your dog can't see you.
-you give a come in whistle and hope the dog responds.
-you are now not progressing toward the bird and the dog's momentum is crushed.
-the dog is significantly off line.
-now you need the 'over' cast to get the dog off the point where you can see it, anyway.
If it's a trial, you're toast. If it's a Hunt Test you're in deep s...t.
That's why I think an 'over' is the correct cast off a point. Just my opinion, worth exactly what you paid for it. -Paul