Macro idea for KT Frost Blasts

/focus [target=mouseover,exists]; target
/castsequence [target=focus] Rejuvination, Nourish


/focus [target=mouseover,exists]; target
/cast [target=focus] Flash Heal

first is a sequence if you want to use more than just one spell second if u are just spamming one spell

So the idea is you put this macro in an unused action button
Keybind that position to an unused keyboard or mouse button
Mouse over the Ice Block (without even haveing to click) and use the keybind and it will make that person your focus and heal them without changing your current target.