Stunlocking Ifrit with Perpetual Ray
Hard-mode Ifrit can be stunned, so we can use perpetual ray to prevent almost any mechs from going off.
If we skip the nail phase, though, at 29% he goes invulnerable. Thus, we have to release the lock at 50% so he can create nails. In hindsight, a cleaner run could have been done by either a) 7 players diamondbacking and having someone self-destruct to wipe all nails at once, or b) having most players continue to spam perpetual ray and one or two players eliminating the nails.