Just watched were no man has gone before.
Why didnt they just go with the orginal plan of just marooning him.
After they fixed the ship they could have just beamed up and left him and Dehner on planet as the transporters were working.
Once back in contact at starfleet they could have just made the planet a quarantined planet like talos and left it as that.
If "Where No Man.." had been a Next Generation episode, that's probably how it would have ended. In 1965, however, a bloody fistfight-to-the-death was still an acceptable way to conclude a story on a TV drama.