It soon becomes apparent that he came to the house to set up an accident. Blair stated that "the step is covered in something slippery, and Connor falls and knocks himself unconscious, which is when they realise they must take these threats seriously." The storyline comes to the forefront of the show when Frank wants Connor removed from the scenario.
It becomes apparent that he visited the house for an accident. Blair stated, "the step is slick with something, and Connor slips and knocks himself unconscious, at which point they realize these threats are serious." The plot takes a significant turn in the series when Frank wants to remove Connor from this situation.