Clique target with hp check and stopcst

[фткyн 1469]

Okei, hi guys have this clique macro:

Clique:TargetUnit() RunSuperMacro("HEAL")

where HEAL is:

 

/run if (UnitHealth('target')/UnitHealthMax('target')>0.99) then SpellStopCasting() end
/cast Flash of Light(Rank 4)
/script TargetLastTarget();

Sometimes it switch targets, what i must to do?