Simple addon that switches your focus macro automatically to the correct arenaX of the enemy healer.
Macro will stay as focus if there is no healer.
Just type auto in the name of your macro and the addon will do it's magic in the arena starting room (and between rounds in solo shuffle).
If you're like me who have some macros specifically designed to target healers, this is the easy solution!
Dropping focus from Prowl or Shadowy Duel etc will not affect your macros anymore!