Why our life taker Ascher whatever kept coming back to his mother's old house to sneak into some musty old basement room? Then to be there right at the time our feckless FBI woman decided to poke around? I mean his mother hadn't seen in him 19+ years
I suppose it is possible that he knew that Jolie's character was in contact with his mother. He was let in on a few of the case details and it is I guess entirely possible that he holed-up there in under the assumption that the FBI woman was going to turn up and that he could kill her.
I often drink to make people seem more interesting