Listening closely during Granite's final moments, the player can hear Granite Leader say something that sounds like "Help" or "Now". The former is most likely referring to how they need assistance, even though no units are in a position to run in and assist, and the latter is referring to getting his teammates out of the room so they aren't killed by the bombs present in the room. This is very hard to hear due to the massive amount of static.
Granite Leader usually is the last one to die in the room, and he is the trooper with the "Granite" marker above him, it will stop moving and fade if he is killed before the explosion, but it does not disappear until the bombs go off.
Granite Leader is the only supporting Delta Member in the campaign with scripted dialogue.