All sounds very hectic Joe, good job you stayed up late I had my house broken into while I was in bed asleep clearly after car keys as they only took PS3 and some booze but the house two doors down lost Range Rover, door gets locked the moment I get into the house now, people keep on bleating on about risk of getting trapped inside during a fire etc, but now a days your more likely to get robbed so door stays locked.
And its a good jjob you did go after him or the car keys and potentially the car would be gone and fitting new locks to 3 cars and reprogramming immobilisers aint cheap as im sure you know from your KO4 conversion.
As mentioned just hope the guy gets a good stretch and doesnt take offence to your actions once he is back out!