Dad shoot son over video game!

[Gnizmo]

Final-Fan said:

If he'd had a knife, it sounds like the kid would have just run away.  I doubt the guy is good at knife-throwing ... while drunk. 

The car was not at all viable because the whole situation was explicitly that he was roaming around the house (trailer? apartment? whatever) looking for his game and getting drunk and pissed off.  If the kid takes off there is no way he's going to go out, start up his car, and track him down somehow and then ram the building the kid is no doubt in by now and somehow kill him. 

The kid was probably not aware that the guy was getting and loading his gun or he would have been long gone instead of having to try to knock the gun out of his hands, giving no time advantage over the guy showing up with a knife vs. a gun.

“The son then proceeds to try and knock the gun away and then he runs away,“ Silva said.

Sounds to me like the kid was aware there was a gun involved. Also sounds like he was close enough to make arm contact with the father. Close enough for a knife wound. No need to throw it.