He had already been spoken to by my wife, before my wife knew he had been there all day. She brought it up before I had a chance to. The neighbors (our friends) have also been keeping an eye on him.
Generally in Finland, police are not the "threat and aggression" kind of people - sometimes to a fault. Finland has very low petty crime, but when it comes to random acts of violence from mentally ill, it is pretty high imo. As I have joked in the past, Finns bury their feelings, until they go on a murder spree with an axe.
Unless they're going to stay indefinitely (doubtful since they wouldn't show up in the first place), being the neighbourhood that called the cops on him is a great way to move up the location rankings if he finally snaps.