Originally Posted by
Verain
And can do this when you have low energy and CPs on the other target. Note that if this actually matters, you'll pull a stunt like this:
You have rupture and deadly poison on target A and target B. Because this is a raid you care about, your macros might work on target and focus, or based on explicit mob names. You build to five combo points and, say, three anticipation charges on A. You change target to B. You then press your envenom-focus macro, which casts envenom at target A. Your combo points should now be on B, and now you can build up to rupture or envenom B. It's certainly more effort.
Your damage doesn't just come from the energy, as has been pointed out, you are also multidotting here.
Probably true, but there's often dps being left on the floor unless you switch and at least put up expose armor on the second target (depending on your comp). Still, most of the time I expect you are correct.