Ok. I started a new playthrough. And again, capturing the cave hoppers is ATROCIOUS. Together with next to no shortcut keys for common actions, it is already seriously getting on my nerves.
If you make something, MAKE SURE IT WORKS. Or remove it.
I don't understand can't you just start combat then use the cage on them?
Go into stealth. Throw the net. Ok.
Right-click the cage and left-click the hopper. Run towards it. Ok. End your turn.
Right-click the cage again and left-click the hopper. Shoot the hopper. Bad! Take a step sideways and try again. Shoot the hopper again. BAD! End your turn.
Run to a different map, re-enter, go into stealth, and try again.
Once in a while, it goes into capture mode, which fails most of the time. REALLY BAD!
Try again. Or uninstall, if you have had enough.
And none of the above is documented. You have to Google it.