Sam Witwicky: [referring to Sentinel Prime]
Hey, you've gotta guard him, 'cause he's the key to the whole thing.
Sentinel Prime: Indeed, I am. What you must realize, my Autobot brothers, is we were never going to win the war. For the sake of our planet's survival, a deal had to be made... with Megatron!
[shoots Ironhide]
Lt. Colonel William Lennox: Get back!
Ironhide: What... have... you... done...?
Sentinel Prime: I hereby discharge you from duty.
[shoots him again]