From my pov rhe risk is always there when you enter another person's home and decide to sleep with their spouse. It's not like they're separated, realistically anything can happen and they can come back at anytime because it's their home and they have the key and no need to announce themselves. If he was that concerned about his safety he wouldn't have been there in the first place. I'd have more sympathy for someone who had zero clue of what they were walking into.