Haha! Good one CCDD. Seriously though, how are your neighbors?

In thinking about this, a projectile would certainly explain it. I still think some other oddball set of events is more likely... BUT... what if someone took a pellet rifle or a .22 to it? Pellet rifle would be relatively silent and the projectile could have come up from underneath, struck the left rear gimbal mount arm, broke it, and stray lead could have pierced the prop from there (explaining why the trailing edge of the prop took damage). Just sayin'. Try to get that video! And the flight log!
Mike