Sorry ha ha I was a bit vague, Im really tired.
I was referring to the heart he showed to set himself and have a go at tackling properly. Uncommitted defenders go high or jump on peoples backs, real defenders go low and are always committed.
I dunno if i'm right or not, but I often reckon going low is more about attitude than technique. I mean all of these blokes know how to make a tackle, they have played the game for a while, they understand the bio-mechanics. But at the end of the day, it hurts more, its riskier putting your head in those positions, and its only the blokes with a bit of ticker than persist with it.