Fluid Aura

[bdp12]

Problem is that when they sent the mob flying and put it to sleep, I instantly woke it right back up because I was a MRD and I was using Overpower to hold enmity.

The WHM is doing it wrong. If the intent of the fluid aura is to set up a sleep, they need to push the mob away from you so you can continue your rotation without breaking the sleep.