I was at that game too - my first season as a Parra season ticket holder, jumping on the bandwagon after the 86 premiership...little did I know we were just starting the mother of all droughts - but I digress....
I remember that day him incessantly exploiting that rule that had been introduced (and was quickly scrapped and rightly so) whereby if you kicked before the 5th and last from inside your own half and found touch inside your own half, you were awarded the scrum feed. So whenever Parra were rolling up to their own 40 metre line, on tackle 4 Sterlo would just dribble it over the sideline and make sure it didn't go over the halfway and voila, another set of 6... Never saw anyone else exploit like that until Sterlo that day...