RatherbeFlying, a further thought...
Although immediately shutting down the engine is the best way, we as humans have a flee instinct too.
If the pilot felt seriously threatened, his instinct reaction could have been to apply throttle rather than shut down.
We just don't know. I am quite sure both the vast majority of pro and anti hunters will have never wished this to happen.
More importantly the outcome is what nobody who is serious about flying wishes to happen. Aviation is involved here in a feud between two large and passionate minorities as the utensil of either an accident or murder or something in between.