I must say this new side of the tenth doctor scares me a bit. All of the wrath and anger and power. The doctor in this reincarnation has always been so forgiving, and so bound by rules, that it was completely unexpected for me to see him like this. So here are my questions: was this because he knew of his oncoming death? What did the loss of Rose, the master, and Donna effect this change? How will this affect him seeing the master again? And how will this change effect the 11th incarnation? The tables have turned. Before we knew that major historical moments - the holocaust for example- were safe, but this changes things. What other "rules" of his is he willing to brake?