Board Thread:False Info and Speculative Discussion/@comment-26835511-20150812202136/@comment-13965604-20150812220022

Theo knew where they were (and was able to act on it) because whatshisface remembered a basement. Making them remember the house Parrish nearly died in, which we are to presume is where he went. And since he was the only werewolf left to sniff them out he's who went in.