Pretty much every enemy in SCarlet monastary is called SCarlet something. The /target SC works the same as /target SCA or SCAR etc would. If he were to leave SM and move to say ZG the likelyhood of the macro targeting anything is just about zero. For a while after addons like proximo came out people would make a macro with
/tar a
/tar b
...
/tar z

to load up proximo before the fight really started, you can use the dead modifier (/tar [dead] a....) to target only dead mobs and if you include a cleartarget at the beginning spamming the macro while moving through a pile of bodies will help a little but I honestly think you'll save yourself quite a bit of time just clicking them and having a target leader target macro (/target [target=party1target,dead]) followed by a interact keybind.