I think your taking about League? So that means your team was 2 points behind and someone went for a FG??
My advice would be to have a captain who didnt skip maths...
If your talking about Union keep your hands out of the ruck, or dont come in running from the side, or dont be infront of the last mans feat, or do not push early in the scrum, or do not hold onto the ball too long, or do not drive over the ruck. Basically dont play Rugby..
Also on a side note. Physically (and I have tried this), there is a perfect way of tackling even if you are a small guy. Go back to 2003 Warriors vs Bulldogs Rd 2 and watch the game where Hohaia smashed Willie Mason when he came flying in and made a perfect tackle and copy that technique.