The element of surprise in coming to the house of the person who had supposedly called them in the first place? A possible hostage situation in what was described to them on the phone as an already-existing hostage situation?

Also, who are these multiple individuals and 'compatriots'? I thought this was about a guy who claimed to have shot a family member and was holding others hostage while threatening to burn the house down. When did this one guy turn into a foreign invasion force?