A/n: Thanks to helpful friends and the amazing HTTYD 2 soundtrack (flying with mother omg) I've managed to get a couple more ideas!
Drago's bewilderbeast reared up behind Hiccup, preparing an icy blast to shoot at the unsuspecting Viking.
"Hiccup!" A shout alerted him his impending doom, giving him just enough time to turn around and hold his hands above his head defensively before the cold shoots out to kill him.
Just before the ice collided with Hiccup, a flash of black soared past. Suddenly, Toothless was there. In that moment, everyone watching knew, instinctively, that Hiccup would be okay. The night fury would defend his rider to the last breath, and nothing, not even the most powerful alpha dragon, could separate them.
It made you feel almost sorry for Drago; how woefully unprepared he had been.
Still, it was chilling to see the ice encase the pair. In a literal sense as well as mental; the rush of cold air spread throughout the gathered crowd.
Inside the icy prison, Hiccup and Toothless were crouched together. Hiccup found that he couldn't think properly from the cold, shivering despite sharing in the warmth of his dragon companion. "T... Toothless..." he murmured, teeth chattering rapidly as he opened his eyes, "Are you..."
Toothless let out a small grunt, and Hiccup was alarmed to detect small vibrations coming from the dragon. Toothless never got cold. He just didn't. Couldn't.
"Toothless..." Hiccup snuggled closer to his friend, rubbing his scales in a meaningless attempt to warm them. He could distantly hear the mournful mumblings of those not encased in ice. He could see his mother's shocked face as the ice surrounding him started to warm. Wait, what?
It wasn't just warming up; it was glowing! Glowing a brilliant blue the likes of which he'd only seen when -
"Toothless!" he yelled, craning his neck for a better view of what his protector was doing.
Toothless was glowing the same blue as the ice, warming it with the power of his slowly charging shot.
The ice cracked, splitting apart in a glorious shimmer that cascaded down around the two hidden within. The crowd surged forwards to get a look at Hiccup, but he was more concerned with Toothless than the Vikings around him.
He stood slowly, weakened from even a quick stay in such intense cold, and lifted his gaze to Toothless. The night fury was stood on a remaining piece of ice, growling at the alpha. He was still glowing, looking so mighty with his strong stance and eyes narrowed in determination.
Hiccup realised what was going on and let out a dry laugh. He's challenging the alpha!