Quadding on a druid

[Tulkas]

How exactly? Druids get that one level 5 targeted AE, then it's all rain spells. I was practicing on low level centurions with the Cascade of hail rain, but couldn't get the hang of it, I take a hit and im lucky if I hit the orcs. I was doing it without snaring them, is that the issue that they were just moving too fast? I was being lazy and just pulling with my lvl 1 nuke.