Because Crusader Strike requires a melee swing, you probably need to switch targets. Personally, I’d keep enemies targeted at all times and use mouseovers or click casting to heal people.
Can find templates here:
https://us.forums.blizzard.com/en/wow/t/useful-macro-templates/42937
As for stopmacro, it prevents further execution of the macro, if the conditions set on it are met at the time the macro was pressed.