In the Reboot cartoon they refer to that kind of sprite as "chaotic" meaning they are agressive to just anything that cross their path. I was hunting in Lavastorm for ingredients to make some Fire Temper (Essemce of Fire and Imp Blood) I spotted both a Fire Elemental and a Fire Imp. I tracked the Elemental since they spawn less often. I finally found the elemantal being chased by the Imp, and the imp KILLED the elemental right before my eyes... No wonder why it's so hard to find elementals...
I can tell you, I quickly avenged the elemetal death by slaying the Imp and looting its blood.