I did this one not too long ago! One thing that helped was recognizing that there's no "roar" delay like when the first one shows up. You can just attacking as they fall down from the ceiling. Second was trying to optimize for damage to take one out asap, and reduce the amount of time you need to dodge both of them simultaneously. For me that looked like Barbed Bracelet, Flintsteel, and Beast Crest. Good luck!