I know Brad Fox though I haven't seen him for a couple of years.
He's told the story a few times of what happened that day and the lead up to Plugger snapping.
Without going into the full details, you might remember it was around the time that there was a big furore in the media about (corrected to) breeding substitution with Lockett's greyhounds. In fact it was just before the story hit the papers (end edit).
As the story goes, the Saints were playing Essendon and in those days, the ball hardly came down to the Saints forward line. This was well before flooding and zones so the two of them spent most of the game standing in the Saints goal square together shivering. Brad claims he was passing the time making conversation. He asked "how's things?" to which he got a grunt. Five minutes later he made a comment about the weather to which he also got another grunt. Five minutes later, he asked him, "how's your greyhounds going?" Apparantly he snapped at this and applied the headlock. Brad reckoned he was starting to lose conciousness and could just hear Stewie Lowe screaming "let him go Plugger, you're gonna f***n' kill him".
Brad has never spoken to him since and in hindsight can only hypothesise that Lockett thought Brad knew something about the greyhound doping story that was about to break.
Brad has the distinctive male pattern baldness of the reverse GT stripe down the top of his head. His standing joke when asked what happened to his hair was for many years, "it's still in Plugger's armpit!".