When it comes down to it, the point is that in a three mob situation you always go Scatter > Verthunder/aero because Verfire/stone are not only weaker than their counterparts but also generate less mana. In an aoe situation, you don't need to care about the procs for this very reason. Their sole benefit is more mana generation in a single-target situation. I'm seeing a lot of people saying 4+ mobs should be Scatter spam/E. Moulinet accordingly, which is actually advice I hadn't seen before. I'll keep that in mind too.