Grand Sacrifice Shouldn't Be Exclusive To Cannonback
I'm absolutely in favor of each guard having a unique mod. But this particular mod is far too generic and frankly a waste on cannonback. Cannonback should have a unique mod related to it's cannonballs. For instance:
Napalm Explosion - Leaves a fire patch where the bomb explodes.
Bouncing Explosive - Bombs bounce further before exploding.
Cluster Bomb - Upon impact, the bomb fragments into smaller bombs that explode with smaller individual radius.
Something like that. All the guards should have the option to explode in the raiders face. Basically it's just the living version of dead man's switch.