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I'm sorry for the pun but I was telling my buddy about this story and he said

Welp, I guess it was a clean shoot

One never knows what a person is capable of when they enter your house by mistake and do something like take a shower. The person could be on something stronger than alcohol and could have been a valid threat. That being said, if you are able to leave the house and nobody else is left in the house to be in danger? Call the police and let them handle it. No need to go BACK into the house and potentially put yourself in danger.