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 clear that he came to the house for an accident. Blair mentioned, "the step is covered with something slippery, and Connor slips and falls unconscious, at which point they realize these threats are serious." The storyline gains importance in the show when Frank wants to remove Connor from this scenario.