The full moon was coming up fast. It wasn't the moon specifically that Terrence was anticipating, but what the day represented. The day he was going to end his parents' lives - and then hunt the thing on which he was going to frame their deaths.
Sometimes he was looking forward to it, sometimes he wasn't. The swing between two extremes was driving him a bit mad, so here he was on Bomba's doorstep, looking for a distraction.
He knocked, and grinned, shoving his hands in his pockets.