That roar echoed through a great part of the cave's complex. Those tunnels seemed to shake, even. It was frightening, even a human would get cautious when hearing it.
The fact was that not all beasts out there could make such a roar, not like Dean's.
In the deepest bottom of the cave... something opening its eyes. It was kind of agitated, maybe even frightened. It had good senses, so it wasn't difficult to hear and feel Dean's roar echoing through the cave.
That thing knew that an Ascendant was inside there. In truth, it was expecting to see him soon if he was worth it. Anyway, it didn't hope that such a special human would appear on its domains.
It was a shame for such a mighty monster to admit something like that, but it was actually wary of Dean.