Loki's eyes narrowed as a familiar spark of presence reached his awareness. He was working on a spell, sketching out theories and turning them into plans, when it struck, and for a moment he was not entirely certain if it was real - he was distracted, he was irritable, and the idea that he would mistakenly think he had detected the lightning-flash burst of his brother's presence was not entirely without merit.
He reached back out, but this time it was distinctive - but different. There was something different from the other versions of Thor he had encountered here. It was not strange, per se, but... he did not feel like the thundering warrior that Loki was accustomed to. He rose to his feet uneasily, and between one breath and the next he was in a different place, honed in on the presence and wrapped in magic.
For a moment, he remained unseen. This was, without a doubt, Thor. This was not, however, the form he had even halfway expected him to take.
This was practically a child, all smiles despite the sizeable danger he was unknowingly walking around into, all bold confidence and the posture of one raised as a warrior-prince. Small, inexperienced, but distinctly Thor.
Ignoring, for a moment, how complicated this was going to make matters - and sparing a brief irritated thought to whatever power, entity, or force controlled the Seal - he was fairly certain that at least Mother would not be terribly displeased with this situation.
Wrapping himself and Thor in a concealment, keeping them from the eyes of the ordinary people, and allowing Thor to see him, Loki stepped forward. His appearance spoke of Asgard, his clothing as out of place in this ordinary Midgardian town as Thor's, and his own bearing regal and authoritative; anything less would very likely be ignored, and anything more would be suspicious.
"Thor." His tone was somewhere between irritation and amusement, "You are drawing unnecessary attention."