Originally Posted by Nostferatu

The reason we use macros is to perform multi functions by pushing a single button or click and thus consume only one GCD in the performance of these multi functions .
In this case the idea is to get dps onto the tendon as fast as possible.
I'm not suggesting that HM is off the GCD at all or make a target macro with just HM in it. I was responding to the question posted by Chanetta weather to use HM or skip it and apply SrS.

Firstly HM is added to the target macro which would have other things in it like ES or AS or CS and could including RF a trinket ..etc etc... Whatever u want the macro to do.
Secondly by adding HM as i said , you don't have an extra GCD as a single GCD is used in the macro to fire ES, ( your shot) etc... Lag and human error do not come into play.
My Tendon target macro looks like:
/cleartarget
/target Burning Tend
/startattack
/Cast Hunter's Mark
/petattack
/cast explosive shot