The goal was to find out if the minion was killed at then end of the monologue, since the party has been invested in thinking that the minion was the BBEG.
Well that didn't go as planned.
Edit: Apparently posting images is down at the moment, so had to troubleshoot.
Monologue implies that a second party isn't necessary, just an audience.
Also I'd have had the BBEG either call in another minion or use Speak with the Dead or Revivify. What a fucking power move that would be. Man, I'm going to use that now.
Great options. Alternatively, I would have had the BBEG just keep monologuing to the corpse without breaking stride. Maybe only realize the kill at the end of the speech as if the minions death was both accidental and irrelevant. ("Do you understand now?! ... Oh. Yuck. Somebody clean this up!")
The idea is that the party was seeing the event as a remote viewing… the minion was the person that they ‘thought’ was the BBEG until his boss showed up. The idea was that they were going to watch him get beat down while the boss was monologuing and only at the end it didn’t matter if he lived or died. I was really trying to ratchet up the bosses evil meter. I had measured out the rolls so that there would have been a 50/50 shot of him being dead on the 3rd roll, but crit’d the 2nd roll.