Prompt: Spock, McCoy - Definitely Dead
Redefined
Leonard isn't entirely sure what came over him. All he remembers is rushing into the large interrogation room beside the holding cells in the bowels of the alien ship, seeing a blood-splattered Spock strapped to a metal gurney, and then losing his goddamn mind.
The next thing he knew, he was standing over the lifeless husks of the aliens and holding a phaser with a severely depleted power reading and hearing Spock inform him, ″Although I do not possess a medical license as you do, Doctor, I can assure you that my captors are definitely dead.″
By the looks of things, even the hard exoskeletons the aliens sported were no match for Starfleet phasers set to 'kill' and wielded by a CMO with lots of experience with the vulnerabilities of a variety of species and enough time and fury to shoot at them until they stopped twitching.
According to Spock, when later asked, it had taken a ″not-insignificant amount of time.″
Back on the Enterprise and safely in med bay, Spock had regarded Leonard with a new intensity to his gaze, though, to Leonard's relief, Spock appeared to hold no disgust or horror at Leonard's actions. He merely watched Leonard from his reclined position on the biobed as Leonard went about his duties and saw that the rest of the landing party was patched up and discharged as needed.
When the last crewmember had been ushered out of med bay, Spock finally spoke. ″Thank you, Doctor.″
Leonard looked at him from the end of the bed. Spock still didn't appear disgusted or disappointed by Leonard's display of rage, in fact, he looked almost curious. Leonard suspected that they would be having a discussion about what happened on the alien ship sooner rather than later. ″You're welcome, Spock.″