User blog comment:Cottonmouth255/Discussion of the Week: MH4U Bosses/@comment-6050823-20140526174917/@comment-5020152-20140526192714

@Banned: I'm fairly sure that the rock carried by the Tetsukabura Subspecies was glowing in a similar fashion to Uragaan's bomb-rocks, so scales probably have nothing to do with it. The rock itself is just explosive.

That said, we don't even know if Tetsukabura Subspecies can use the Slime/Blast ailment.