Knock it out the sky and call the cops. The owner can speak to them when they come to pick it up - its illegal to fly that close to property - CASA regs:
?You may NOT fly closer than 30m to vehicles, boats, buildings that are not on YOUR private property or you must have explicit permission from the private property owner.
?You are NOT allowed to fly over any populated areas such as beaches, other people’s backyards, heavily populated parks or sports ovals where there is a game on.
?You may NOT operate within a RADIUS of 5.5km of any aerodrome, airfield, airport, seaplanes taking off or landing, helicopter landing sites which may be located at hospitals, police stations or other locations that you may not be aware of. It is YOUR responsibility to find out where they are and ignorance is no defense in the court of law.
?You may ONLY operate during DAYLIGHT – NO night flying! Only in good weather and you MUST be in visual-line-of-site of the Remotely Piloted Aircraft – RPA.
?You may NOT fly above 400ft (123m)
?You may NOT fly FPV !!
This guy got an $850 fine:
http://www.news.com.au/technology/gadgets/qld-man-first-in-australia-to-be-fined-for-flying-a-drone/story-fnda1lbo-1227196644698I've got no time for idiots who break the rules. If the drone hits someone it can cause some serious damage. If one hit one of my kids in the garden I'd sue the arse off them.