Bond meets M and learns Quantum killed Fields by drowning her in crude oil.
M (Judi Dench): "It's about trust. You said you weren't motivated by revenge."
James Bond (Daniel Craig): "I'm motivated by my duty."
M (Judi Dench): "No, I think you're so blinded by inconsolable rage that you don't care who you hurt. When you can't tell your friends from your enemies, it's time to go."