User blog:Qwertyqaz/Leveling destruction

I today as I was atacking a giant camp that as I sat their spamming the crap out of firebolt on a mammoth that my destruction wasn't going up at all the entire time, but when I killed it the bar inched over just slightly. So I figured If I wen't to a bandit camp and just murdered a bunch of them my destruction would sky rocket, does anyone know if this is how destruction actually works?