I think your thinking of conduit which works very well with it. Also it does a short root, so not great damage but stacking chill which also slows and Condit refreshes all that chill. It also meshes great with arcane singularity as it doest let people leave the area before it goes off.
When tab slotted you have to hit tab twice quick as the first hit shows target and second executes. You will also still have some animation that looks like your casting it on yourself but the frozen ground shows at target. I am surprised there isn't more love for this spell. I absolutely love it tabbed