In this incident it's possible that Goldie never entered onto the property at all. In the UK many houses have front doors which open directly onto the street, with no front yards or gardens. This incident may have been entirely in the street.

Here's one extreme interpretation of events. Drunk man is looking for his friend's house but gets the wrong place. He knocks on the door, loudly because he is drunk. Stepfather comes out and remonstrates with him. Voices are raised and eventually the drunk tosses a bottle. Step-father gets angry and attacks the drunk. Drunk fights back. Son comes out and fires a warning shot. Drunk drops what he has in his hands and surrenders. Son shoots him in the chest.

Police arrive and try to figure it out. The Evening Times says they "eventually" arrested Ali, which suggests it took them some time. Ali admits he was wrong and over-reacted. End of story.