Anything that could be said about landing technique and drops has already been said, but there are a few other things that I think you guys should be drilling.
Your top outs could use some work. Never use your knees when you're getting on top of an obstacle. At least swing a leg to the side if you're afraid of hitting your shins. Also, I imagine that your climb ups could use a little work as well. Good top outs and good climb ups usually go hand-in-hand.
I saw a lot of double-foot punches. If you really want to work on flow and fluidity, eliminate those pauses in momentum by using a split-foot take off. This will also significantly speed up your runs.
Control is extremely important. I could tell that you felt a little rushed on some of those longer runs with the staircase. Take it slow and build up the confidence and technique to do things faster. Never sacrifice good technique for speed. Also, watch out for your recovery from landings (without rolls). Make sure you're absorbing that energy from the fall. If you feel yourself bounding forward to dissipate the momentum, you're doing something wrong.
Lastly, don't overlook the variety and creativity that parkour offers. Use some different vaults, do some rail work, execute precisions, mix it up. Watching different people do the same exact moves over and over again gets old fairly quickly.
Hope this helps a little. Best of luck!
