It’s basicly taking advantage of the simple basics of heads-up poker: “Be agressive, the flop probably didn’t help the other guy out”. The advantage you have by first re-raising, is that any opponent could (and maybe should) put you on a big pair, or an AK, AQ — depending on what came on the flop.

For evidence that you can and should still follow through, check out the hand on Teh Jinx Poker — it’s a perfect example!