Theo had been somewhat startled by the partridge-pear when it had changed before him and fluttered away, but the second message, the bird with the note that plucked one of Theo's rawer, already tense strings, had the boy in a panic. He didn't have the capacity to wonder who the 'they' the note referred to was, just that he was being sought after now and the hut, Greg's head, wasn't safe.
Watching the bird fall to ash had tipped him over the edge, and he'd dashed out of the door with an energy and determination that he hadn't shown in weeks; of course he was still afraid of being outside, but Snape was a devil Theo thought he knew (when he remembered who he was) and watching the bird crumble had frightened him more than Snape's warning to stay in had.
Theo had raced barefoot over the snow and twigs and mast covered ground, his feet numb after two minutes, burning again after three - Theo climbed a tree to both get his feet off the ground and to keep watch, keep safe.
No shoes, but he'd managed to bring his journal...
He wrote frantically to siren-call Greg to him and safety, frantic to get Greg to him so that whatever had been heralded by the bird wouldn't be able to do him harm. He told Greg where he was waiting (he thought anyway) and waited, perched on a bough and watching carefully, so cold that he went through shivering and came out the other side, his bare toes fading from red to blue and burning from the cold, his mouth tinged the same as he wore only the hoodie and trousers he'd been wearing indoors and it wasn't as though he had much fat on him either.
Despite how cold he was he didn't move from his perch, keeping an eye out for Greg and turning his head toward the sound of his name being called in that familiar voice. "Here." he called back, dropping down from the tree with a casual grace that hadn't left him, his bleeding feet leaving raspberry drips in the snow. "Greg, Greg, be careful." he called, following it up with the words for a spell of protection that didn't work as he still didn't have his wand.