If he got stuck, then he didn't fly over. I had a RIR rooster get stuck in the netting because he ran into it. Neighbor's dog in the middle the night running loose was the catalyst. I agree they may TRY to fly over the netting. RIR and Australorps can fly over the netting.
The first bird we processed was tough. This is when we learned they need to set in the refrigerator for 24 hours before freezing.
I don't think they will fly over a 4 foot high fence. Muscle is heavy and they have lots of it.