SV BLASTS in M+!

Also, quick general question.

Possibly from being a healer main, or whatever reason, I have adapted @mosueover macros into nearly all of my damage abilities.

I like the fact that I can maintain my main target while easily effecting any other mob in a pack.

However, I have ran into a very odd issue that Kill Command spell will not let me utilize it as a mouseover macro. No matter how I write the macro, it simply doesnt work for Kill Command spell in particular.

Just as an idea, my macros look something like this:
#showtooltips
/cast [@mouseover, harm, nodead] [] Kill Command

Any other spell, this very simple macro would first check to see if I have a mouseover target then if not just cast on my current target.

However with Kill Command it does not work properly. Does anyone know the reason for this?

The reason why its so important to me, is it would be much easier to spread the pet bleeds to multiple targets in a pack(for the attack speed increase) while maintaining my main target…

The only logical thing I can think if is due to the fact that the pet is a separate entity than me BUT that reasoning fails because pet ability macros work just fine. Things like Ankle Bite or whatever have no trouble being utilized in mouseover macros.

Does anyone have a solution for this or at least a reason why?

Thanks, much appreciated.