[hr]
gun? Skewer?
Just kidding, but now you see why people avoid damsels for cycling. Besides the inhumane aspect of it, most don't want to keep them after the cycle is done, and this is what happens...
Everyone I have talked to has had to remove the rock to get them out.
As was recommended though, patience is the key. Leave the net in the tank for a while, so they can get used to seeing it. Then only move it very slowly coming up to them....then WAM! scoop it up.