or so it would appear...
Aero-News Network reports that this Piper and Stinson most likely missunderstood who was going to be yield to the other. Turns out the pilots, who are neighbors, had communicated while the Piper Warrior II was on short final and both pilots apparently thought the other was going to yield.
Thankfully no one was injured in the accident since, as you can see from the photograph provided by Doug Reeves at VansAirForce.Net that the pipe came down to the side, protecting the pilot in the vintage Stinson 108-3 from the spinning propeller blade.
In the immortal words of Phil Esterhaus: "Hey, let's be careful out there!"