This was also the age hormones took over you and you discovered masturbation which you dive deep into. You go through severe growth spurts early, and are much taller than all your peers. Testosterone gradually starts fuelling you as you take on a more aggressive personality after your life goes into the shits. You experiment with "counter-bullying" and it feels good. Pummelling the living crap out of kids who do you and your limited circle of friends any perceivable wrong.
This isn't going to happen. It does not make pyscological sense. How would a sex-driven bully turn into a nice engineer/sniper?
First off its psychological, and I don't think you understand psychology if you're saying that it doesn't make sense. Second off.. Well, here's a bunch of counterpoints.
a.) counter-bullism is different from regular bullism. He isn't necessarily doing it for sadistic pleasure, he's doing it on an aggressive defensive action.
b.) he's not nec. sex driven as he is hormonal. During the ages in which a male is between grade 6 and 8 vaste physiological changes happen in his body resulting in confusion and sexual curiosity. With increased testosterone levels he'll have an edge over other boys physically, will be more high sensation seeking, and ultimately will want to go GET SOME. If you don't understand this your balls probably haven't dropped yet yourself.
c.) did your actions when you were in grade 6 affect who you are today professionally in a significant manner? They didn't unless you did something severe like kill somebody or have something domestic happen like primary family deaths.
d.) wait a minute, are you trying to suggest that snipers are nice people? They kill people. For a living. You can't be a pacifist sniper. The cause and effect of hurting others has to exist in someone within this trade for it to make any sense. Saying that he goes through life without harming a fly to suddenly become a master sniper is what makes no sense.
f.) Engineers have to go through years of school and there are many different paths to doing it. Shit dawg, ever heard of a combat engineer? Military position. Easiest way to get to the sniper/engineer trade off is going engineer in the military while working on marksmanship/joining a small arms team.