Why has Wlad changed so much in 2 years?

I always had Wladimir down as this quiet dude that didn't like confrontation. In their first press conference in 2009 Wladimir seemed to be taking the high ground saying all this trash talk is bad for the sport and that he would punish Haye for 12 rounds and jab him and give him pizza face etc. Pretty boring really. Fast forward 2 years and the roles seem to have switched. David Haye seems to be the one that don't want to get into any kind of war of words with Wlad. I think we was all expecting the entertainment and quality sound bites to come from Haye but they have all been from Wladimir. I mean Haye hiding backstage whilst Wladimir does his interview wtf was that all about? I think Haye is just as shocked as the rest of us the way Wladimir has come across in these press conferences and has realised Wlad just won't sit there and let Haye insult him like 2009. So where did this funny and entertaining Wladimir Klitschko come from? My theory is that maybe he has a better grasp of the English language then he did 2 years ago and now feels more comfortable talking English. What do you guys think?