Presumably, he must have finished setting up the lights before falling off the roof. Otherwise, the PHB would have been much more concerned about his wife's displeasure at the lights not being done than an unsightly dead/injured homeless man disfiguring the flower bed.
Deserving of a Golden Mitt Award for compassion. The average PHB would have called the police and said the guy was trying to break into his house. Or carted him off in his rooftop dog carrier.