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This may or may not be a valid analogy, but to me it seems that the black triangle is more tangible or powerful "forcefield" than the red. The length of the red triangle weakens the pressure being applied to the dog's line. Even worse, the red forcefield brings the dog's attention to a very viable off-course line. At normal layering distance, the black triangle shows more pressure being brought to bear on the correct line. Additionally, only one off-course obstacle is within the black forcefield. Actually, if the handler moves a little more to the dog's left, an even stronger push to #6 is created. If you'd like to play with this effect, load the info below into your Course Designer 3. You can manipulate the triangles just like you would any obstacle.
Begin Course Designer Version 3 For a free viewer, go to www.coursedesigner.com/viewer AAJheJxF0W9Ik0EcB/Dv77nN9LGmQwwXm7cXmkEWlC2NlGSYiEVEFqFSIGyE1Bw8 W0S+kt4LKSq9DITeRQRp5AvZ6zDKFwtMQs0QqZhzmT3V9lz3+Nzw7sXd5773jztG npH6x01QhQiyksagAxqIMYrw8d+xi2+WFqoQKtd6mOejrvHbFAE2Kj9U9+QGCw1y YSeNLs3stmuQkeR49VwtD34Lb34te5V/JiZr+pES4B47Gz70vca/cmF52z8lpJka 7nYtn0yvHFtcPBKFM2wQejHDOuoOZgF+neSFxrzHC6UHhHAbnz+tbYjz1q5otkzZ rotOy56SF/2+OveIPaV1PSReUlJs0VvxgsawAI24yz5qOlBVtio7jmYxqhfVi3qz 7V9RYaRzEztFHUbjn6mS/XWx8lbsaxiGs2e7rQc/vb4daiRb78SW9z0rimFWT+X3 JJ+wD5tfannmqXuVuG5z23/L1eKa0Pi8/R2meF1BOBVwdELr+kU4rZQqhLOEJqVr okJmZ5Sm810mIaTkz2bkQ59VmjOflBCalfosq5TQovQcYR/hXIBfBSZFovJvOgL+ CJcyok3cONp9P5EMdsSjiaGGZPBm3LgbAO3l+CHmieWuxI3YwL3g5YGHUWNw6I6T /gfbbrA4 End Course Designer
The next time you run, may the force be with you.