[Stanis]

First, why do you try to run into him?
Second why do you run away when low life? Forget getting out of range.

Burst damage is the key. Use all you got, every instant, DC+fear+fear if not BM, Shadowburn if you have it. If you see your immolate getting disrupted , instead of just stand there or run circles waiting to reaaply dots, use your wand.
And dont forget to retarget/re send pet when he feign dead.