Hi there

I'm Boxing since last week and by now have a team that consists of 4 Locks and 1 Pally - Currently at level 21 or so because no RAF in my country - And I was wondering, how our successful Arena players are targetting the enemies. I've noticed, that there is quiet some latence between the time I target an enemy with my current leader and the time, where it is being displayed to my followers, that I do have (another) target.
Basically that's my main concern. How to instantly switch targets for fast spike damage on another enemy without having to wait until the server says: "Hey, the Leader has now the Druid targetted". So I came up with the following.

5 vs 5 Arena
I'll target one enemy after another and assing each of my toons one enemy to target. That way, I'll be able to switch focus in an instant on any of my toons. So - Focus will be used to direct the attacks to the enemy.

Thinking about the buttons, referring to the current leader to be assisted:
F1 = Toon1: /assist
F2 = Toon2: /assist
F3 = Toon3: /assist
F4 = Toon4: /assist

So, the macros would be on all toons:
NumPad1:
/focus Toon1
NumPad2:
/focus Toon2
NumPad3:
/focus Toon3
NumPad4:
/focus Toon4
Except, in case they would focus themselves, use /clearfocus instead.

Then the attack spells would look like:
/cast [target=focustarget,exists] Curse of Agony
/cast Curse of Agony
(*Note*: I don't know, whether this would work, but with that, I'd basically would like to simply cast any spell - CoA here - in case I've got no focus, if I have, cast it on the target of the focus)

So, now there are my problems I can see by now:

1. In case, I can't target every enemy, because they are currently invisble, I may not be able to assing each of my toons a target
2. I probably won't be able to direct my attacks towards all of the enemies, since I lack one target my healer would have
3. If the enemies use feign death, stalk, etc... I'd have to retarget

Good thing:
I can still simply use my current leader to target any enemy
Bad thing:
That would be the latency I'd like to avoid..

I'd like to know, how our top rated players can handle this, what do you think about my idea? ^^

edit: I'd basically switch my focus to target another enemy.