He cursed. Even an idiot like Thor would easily figure out where he had gone, and he anxiously scanned the crowd for a red cape or a spark of lightning. He saw nothing and began to calm himself a little when he registered something possibly red moving towards him at high speeds! Abandoning his disguise, he put all his power into a force field and braced for the impact...
Which never came. Instead a loud bonk sounded and a very pink pony fell to the ground stunned. Loki looked at the surrounding crowd, who were looking at the powerful alicorn that had just appeared. He cursed his carelessness.
"What are you staring at, mortal creatures!?" He screamed with malice. He accompanied this with a blast of power that flashed from his horn and gouged a chunk from a nearby building.
Immediately, pandemonium raged. Loki smiled; it would be easy to slip away in the chaos. However, as he spread his wings in preparation for take off, a magical force hit the force field and he whirled around with a snarl. Standing there was the alicorn princess, Twilight Sparkle. Loki took a moment to curl his lip in distaste at the ridiculous names these ponies had. "I wasn't expecting to meet a princess here" he snarled mockingly, "but you will find that only the most powerful beings can defeat monsters like me" before combining his normal and Jotun magic. As he fired a blast, his fur turned dark blue with strange markings and his eyes changing red. His magic blew twilight's shield apart.
Then, with a powerful beat of his wings, he soared into the sky, his fur slowly returning to dark green as he departed.
As soon as he left, there was a mad rush to help Princess Twilight to her feet. Luckily, the shield had borne the brunt of the impact and she was unharmed, albeit a little shaken. "Spike! Send a letter to the princesses and inform them immediately. Pinkie Pie! Are you alright?" Pinkie bounced back up. "I'm fine! Just a little surprised is all. I was going to hug that pony because he was new to the town, but he had a magic force field thingy and I whacked my face on it." She frowned. "He's a big mean meanie pants!" She concluded.
Loki gave a gasp as he crash landed in a forest clearing. Combining his normal magic and jotun "skills" had taken more energy than he had thought. But as he lay in the clearing, something worried him more. He had lost control and allowed the monster to take over, something he had sworn to himself would never happen again. He was repeatedly imprisoned for a reason and the monster had awoken in him as his mind had flashed back to the memories of grief he had experienced, as well as jealousy and anger. Here was no better than Asgard. Everyone hated him a monster, and nobody understood. He sighed loudly. He used the last of his strength to haul himself into the relative safety of a tree, and at last succumbed to sleep.