I really need some answers, cause I'm coming up black.

By brother got home last night, his fingers nearly frost bitten. Thank God he got them warmed up, but it wasn't that that I'm needing answers. It was why his fingers got that way.

He was dog sitting at our Mom's house, and he said that her dog, Momo, was barking at something. He didn't think anything of it at first, but Momo continued to bark for half an hour. He started to feel worried, and he told the that he felt as if there was SOMETHING there that was pissed. He grabbed Momo and headed outside. Not a few feet down the street, he said he looked back and saw a dark figure in a black trench coat. He merely blinked and it was gone. After all that, he jogged hone in the cold.

I can think of a few things that might have a connection. I know that my Mom has two mirrors in her bedroom that face each other, and in some circles they think that that might open portals for spirits to come through. But I have no answers right now, and that's all I want. Any ideas?