So what I want it to do is, despite having a hostile taget, when I press alt, it would cast RM on me. I kinda can’t get it to work with [mod:alt] and [@player].
I usually bind key combinations to action bars with something like bartender (not sure if the default UI can do it). It’s much cleaner and easier to modify in case you want to rearrange spells.
This will get the job done as long as you have auto self cast enabled (who doesn’t?). But, since you might want alt to force self-cast even when you have a friendly target: