I don't think its a Zone so much as he just got really pissed off. Doing those things were things he could have done at any point, with Darach he changed tactics and went juggernaut on his ass and against those Jedi I think he was just normal, albeit pretty ticked off.
The real Zone moment is at the end of Deceived when he utterly embraces the darkside and gets a massive boost. But thats permanent.