Hi, i dont do much posting here and im not sure if this will show on the thread i want it to but if the hounds are attracted by time travel, doesn't Chandler specialize in time magic? And he was in Chicago the next night, mabey he sent them back 1 night to attack harry not knowing eb would be there.
If chandler specializes in time magic (a point made in text in PT) then maybe corner hounds are the easiest outsider for him too summon?