Like his binary bonded partner Slugslinger, Caliburst is merely putting on an act and playing the role of the cold and fearless Decepticon warrior he outwardly projects; it's just that he's generally more adept at keeping the mask up because of his former life as an actor. While not a good actor, more the kind to be found in the freezer section next to the other pork products, Caliburst does know the importance of staying in character. Given that he joined the Transformer conflict for the money because there was no one left on Nebulos that could stomach appreciate his "talent", he has an incentive to not screw up.