I've seen several knots that can be called a quick release.
One is you tie a clove hitch but instead of passing the end of the rope under in the last step you double the rope and pass a loop through it.
I have also seen people refer to the chain knot as a quick release. In that one you tie a slip known and then keep passing loops of rope through the slip loop. If you wan the knot to quick release you put a stick in the final loop then just pull the stick and go.
I think the knot shown in the related link video is probably what you mean.
Use the quick-release knot. It's perfect for keeping your horse in spot and it's easy to untie in an emergency.
if you tie a horse up you should always tie a quick release knot never leave a horse unattended when he is tied up
tie a quick release knot that can be immediately undone in event of an emergency.
The most secure knot to use when tying up a horse is called the Quick Release Knot. It is very simple, and one of the easiest to learn. It is handy in the way that you can simply grab the end of the rope and pull, and the knot in the rope will release immediantly. For info on how to tie this knot, try here: http://www.newrider.com/Starting_Out/Getting_Ready/quick_release_knot.html
The best knot to use is the Quick Release Knot, it is safe and easy. Go to http://horses.about.com/od/basiccare/ss/quickrelease.htm for step by step instructions
Tie a quick, loose, releasable knot that will give give if he gets spooked or tries to run.
I tie an overhand knot then give a quick jerk
There are many quick release knots, there is no other name for them. The simplest is a half hitch. A cow hitch or lark's head is quick release, and a slip knot can be released and spilled quickly.
a tie knot
a quick release know is one that if you tie your horse up , if he/she gets freaked out and start to panic, they cant pull the know loose (its impossible) but if you grab the other end, you can pull it loose almost immediate, with out actually untying anything. its a split second knot! as for how to make one, go on google and google images
Another name for the Hercules knot is the square knot.
tie it tight enough that it can't put its head under the rope, but not so tight it spooks, also, always tie with a quick release knot, although some horses can untie, its better than having them hurt themselves