TIP:

Code:
/cast [target=focustarget,exists][] Wind Shock
I use a similar leader/focus as you but I use this macro syntax so my "main" toon can use focus for something else. This macro is used on all toons, if my main has his focus set on something else, it's obviously not going to have a target, so the "[]" will default to the main's target but the slave's focus will always be my main toon and they will cast on my main's target.