How do you redo the Guarded Sarcophagus in Buried Shrines?

I died fighting these cuz i keep getting trapped, but it's so satisfying to do regardless. problem is if I respawn, any unkilled soldier will stay back to being a statue and it wont redo the same way other mobs do when you Respawn, and the only way I can do it is by creating a new instance, which means i have to find the area again. Is there any other way to redo it without having to clear the whole map again?