Alright, but I don't think a CP 6 is aggressively reactive exclusively to anxiety/fear, especially if an aggro attitude assumes a prominent aspect of his general demeanor and/or public face. For instance, a friend of mine who fits SLI CP-6 sx/sp (mountain climber, international hiker, wants to skin children and bathe in their screams and blood, etc.) is most violently and frequently hostile toward weak, dependent, and stupid people. Existential concerns don't make him aggressive, they lead him to drink. Secondly, however you happen to be defining it, I think that simple uncertainty, confusion, and even non-thtreatening "WTF?" moments provide sufficient internal tension to qualify as enneagrammic fear/anxiety. Pants-pissing isn't required, but response is likely proportional to the strength of the disconcerting stimuli and the subject's mental health.