Here is a quick video of how to use a piece of webbing to assist a firefighter out of a basement window. Understand, that depending on the height of the basement, the length of webbing needed may need to be longer. A 30 foot piece of webbing tied in a loop will work for most situations. The reason the loop is used is so if the webbing slips, it wont completely slip out of your hands if your one of the firefighters pulling on the outside.
This is just a quick way to use some webbing to make a harness to remove a victim or a downed firefighter. You need at least a 20 foot piece of webbing and no more than a 30 foot piece. If it is longer it tends to just get in the way.
I will normally keep different lengths in my pockets for different uses. The one that I keep for this type of use is kept looped with a water knot.
For a victim or downed firefighter lay the webbing around the victim. Grab the webbing at the feet and pull it up between the legs. Hold it tight and grab the webbing on the sides and bring both pieces up under the arms to right over the chest. You should now have three loops, one from between the legs and two, one from each side, under the arms.
Pull the two side loops through the loop coming from between the legs and pull tight. These are your handles. Get all webbing tight and snug under the arms and between the legs.
You can now pull and drag your victim. You can also lift a victim up out of a basement window. Check out the pictures and the attached video.
To get the straps on the back of a firefighter or victim, roll them over on their front and perform the same method. You will see this in the video.
This does take some time and is just another method that is available to you. Just another tool in your tool box.