Kill the npc's thrusters and leave them in space without killing them.
That's how you can avoid the bounty.
Kind of hard if the Clipper is reverse fighting you to kill the thrusters. Wing NPCs mostly flee if the wing leader (usually the biggest ship) gets destroyed.
Anyway, I think all NPCs should have some sense for self preservation and try to get out of the fight if it appears to be lost.
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