Short sweet and to the point, the handcuff knot is vital to RIT/RIC operations. It can be used to attach to down firefighters either using the loops created by tying the knot, or using those loops and attaching a carabiner. The biggest advantage is that the knot creates to pulling points for firefighter to use in the rescue attempt. This provides a great mechanical advantage in lifting the firefighter from below grade.
Bottom line this knot saves lives! You need to be able to tie it in the dark, in the smoke, with gloves on, under the most stressful conditions imaginable. Take some time this month (whats left of it) to practice this knot like someone elses life depends on it, CAUSE IT DOES!
As usual thanks for reading, spread the word, and STAY SAFE!