I have a hole in the insulation of my garage door from a similar experience with a Li-Po Brushless system on a Formossa I. Luckily I got away with only a broken prop and dented nose cone. From then on my mantra with electrics is "if the battery is connected, the engine is at idle" (like a gasser). I also don't walk away from a connected electric with my antenna collapsed. That's another story! Press on. Hope you are doing better.

Regards,

-SLFlt