I had the opportunity to witness some BASE Jumping from a local restaurant on Friday, but I didn't have as good a view as a guy operating a drone over the Perrine Bridge did.
A "low pull," is when a jumper tests the limits of the amount of space that separates the object the person jumps off to the ground beneath. It's a dangerous practice, and accounts for many impact deaths annually.
BASEjumper.com states that body positioning is the most important thing a jumper must be aware of, and that it takes the average jumper approximately 200 jumps before they are considered experienced.