The air was starting to become brittle, cold, dangerous. Perhaps a few minutes could go by at these temperatures and Jason would be fine, but a scarab's body is not equipped for frigid temperatures and Jason knows this almost instinctively. Not just that, but he isn't sure that his opponent will be changing location any time soon- he seems to have the run of the entire chamber, as far as range goes, but the Shapeshifter could always be wrong. At the end of the day, though, Jason's intended strategy of waiting out his opponent to relieve some of the tense pressure clearly isn't panning out.
This isn't working.
But he knows what he wants to do. He can't guarantee that it'll help in the end, but the boy can certainly make the attempt. If he doesn't, both dragon and master will likely die anyway- this surprising enemy doesn't look like he'll be leaving until one side or the other has perished. At least this way, Jason is reasonably certain that both can make an escape attempt and succeed if the new plan doesn't work: an open chamber and the damage inflicted to the ceiling may prove vital.
The scarab's body begins to change, obscured from view by the broken pillar Jason claimed as his hiding place. The air is reaching sharp temperatures and with it comes a spike in Mimring's worry over his master- but Jason knows that he'll be fine in the end, at least as far as the temperature goes. He flies backward from the pillar, his form bulking up and shell becoming metallic rather than shiny. Instants pass and the transition appears almost as if someone was taking a timelapse and speeding it up- where once a beetle hovered cautiously in the air, black scaled wings sprout from an increasingly reptilian body.
Whether Clarence happens to look in Jason's direction randomly or is still focused on finding Mimring, from his viewpoint a massive black dragon would seem to materialize out of nowhere, hovering near the back of the chamber, and challenge the man with a feral roar- the sound echoing and resonating throughout the chamber and causing the more-damaged structures to shake. The Darkwing Firedrake's presence, while not as befitting of the locale as Mimring's, is certainly more imposing- perhaps not longer but bulkier- a stark black creature who seems to make the broken remnants of a civilization long past tremble in awe at the very sound of his challenge.
The roar serves more purpose than simple intimidation, however. The moment Jason reveals himself with all of a dragon's vicious fanfare is the moment that an unspoken command shoots across the link- and suddenly a lightning bolt is streaking away from Clarence, trailing sparks that vanish into nothingness before either dragon can act upon them. Mimring shoots away from his adversary as quickly as he can possibly go, aiming for the back of the chamber but leaning to Jason's right, as if in an attempt to gain both distance and a favorable position near his master.
Jason can't see the lightning dragon very well at the speeds Mimring is bolting at, but something immediately seems... off. Though focused on escape, the other dragon's mind is frazzled by something akin to pain and those sparks trailing from him seem to be more like shreds of something torn up than a simple trail of energy. He is quickly gathering his bearings, but those moments of disarray worries both of them.
There's no time to act on it, though. Jason opens his maw and a stream of blazing heat pours out, blue flames visually similar to Clarence's but at temperatures equal to- higher than, even- what one would expect from fire. No cold flames, these, but dangerously hot and more than enough to warm up the immediate area. While this is a welcome development it's not exactly the fire's only purpose; the flames would obscure Jason from sight, distract further from Mimring's flight, and possibly deter approach... though, knowing how this battle has gone, that last part may not even be relevant.