The more I think about it, the less what happened in episode 91 fits the Blaze of Glory mechanic from DH. To start with, BoG occurs when a PC has reached the point of death. In this episode, FCG still had hit points remaining, though both he and the party were all very low. He also didn't just decide to go out in a blaze of glory, and then came up with a rational after the fact, what he did was predicated on the established fiction in the game over the course of 91 episodes. The relevant parts are
- FCG is an aeormeton (similar species to Warforged)
- Aeormetons are powered by an arcane core in this world
- Arcane Cores are used in several episodes as the basis for powerful explosives (like, blowing up stone buildings powerful). The episode just before 91 had just such a plot, and we saw the tremendous damage they could do.
- FCG learns in the campaign that his core could be overloaded, causing him to explode
- FCG speculates that if they were ever in dire need, he could purposefully overload his core to blow up
- FCG also has programming that causes him to go berserk when he is under Stress (a special mechanic created for him)
- That programming comes from the fact that he was originally built to be an assassination robot, who's job was to infiltrate as a helpful robot before destroying his target
- FCG has fought with his own nature, and whether he was truly alive, all campaign.
- Other PCs have worried that FCG might have a death wish.
- With things looking like a TPK in 91 (including meta chatter around the table), and Fresh Cut Grass in Berserker mode, he lures the enemy to him away from the rest of the group, declares that he is alive, and casts a guiding bolt on himself to overload his core and take out the enemy
- Mercer does not ask for a d20 roll to do this, he declares it successful, and then has the player roll an insane amount of dice for damage, which all the other PCs join in to help with.
- The enemy is killed, along with FCG, and the remaining PCs are able to escape
- So yes, FCG went out in a 'Blaze of Glory' but it had nothing to do with the rules in Daggerheart.