So which will win, a pro boon prot who is a master of focus swapping, or a pro e-denial who has enough time and concentration to look at the tiny lil things their target is waving around (foci/wand etc lol). Sure you can drain a boon prots entire energy supply, but then they can focus swap while your burn/surge is recharging and so becoming effective for 10 seconds or so while you recharge. Even if you manage an e-burn (-8 energy) say they swap to 2 +15/-1 sets, so they have apple energy to spam RoF etc just before you burn their energy, which will cause them to quickly swap back to their 0 energy set, making your efforts useless. This is all very well but if you spam mind wrack will that stop them focus swapping or what ??
If you pre-empt a focus swap, could you shame/mind wrack so their spell will fail, steal their focus energy and cause damage. Energy denial has always seemed so shallow to me, with a lot more skill and effectivity coming from playing a decent shutdown mesmer. However I can see a shame/mind wrack e-denial mesmer being able to counter focus swapping. I just haven't play e-denial enough (in decent PvP) to be able to know. I usually just shutdown like a pimp