Who said I was wearing any pants?
Firstly, I think the relaxation is good, because it has the same effect as an increase of adrenaline, while it's the opposite. You observe much more, due to a clearer perception. Generally, as it says, due to the way your body is in that stance, it's easier to react, react faster (due to increased speed, agility and flexibility). The fact that the two successive punches/kicks give the sensation of the D-rank genjutsu needle is good for several things.
It disrupts the chakra flow
It at least irritates the enemy, taking his concentration away, giving you an opening
Due to the disruption and loss of concentration, I think it's a valid defense to interrupt any attack that requires a greater amount of chakra (By this I mean any Elemental/normal Nin and genjutsu, but not Tai).
That's about it . o-o