He was trespassing after he was told to leave private property.
He threatened to take the gun away and use it on the property owner.
He may have been right about the custody schedule, but he’s dead right now.
Don’t know how the legalities will shake out but grabbing a gun held by someone else is rarely a good idea.
The property owner escalated the situation by going and getting a gun. He appeared to fire once at the victim’s feet when a struggle ensued. The shooter then backed off where there was no immediate threat of the victim obtaining the gun and then shot him. I don’t know the law where they are, but this shooting is questionable whether it was self defense or not. There are no winners in this.
The guy should have calmly and rationally explained the situation. That is a tough one though, he killed the guy when he should have just punched him. Size means very little in this situation, the short guy has full access to the big guys testicles, sternum, throat, liver and kidneys. He could have dropped him in seconds without killing him...... Short guy here, and big guys only have a seeming advantage or when there are Marquis of Queensbury rules. I am surprised he is not under a charge of discharging a weapon in public. He wasted one round into the ground.
This is why I would prefer a sword rather than a gun when confronting an angry person who is bigger than I would like to get into a brawl with.
He might doubt I would really shoot him — he’s not going to doubt I would stick him, and trying to grab a sword’s blade just leaves you with a very bloody hand.