I'm sorry. I can't watch you go through this. I'm sorry. I thought I could, but I can't....

[after Mann breaks Cooper's helmet and leaves him for dead] Dr. Mann: I'm sorry. I can't watch you go through this. I'm sorry. I thought I could, but I can't. I'm here. I'm here for you. Just listen to my voice, Cooper. I'm right here. You're not alone. Dr. Mann: [looking back] Do you see your children? It's okay, they're right there with you. Dr. Mann: [turns to leave] Did Professor Brand tell you that poem before you left? Do you remember? "Do not go gentle... into that good night. Old age should burn and rave at close of day. Rage, rage against the dying of the light." [Mann switches off his transmitter. Cooper chokes; Cooper manages to get his long-range transmitter reinstalled] Cooper: [gasping] MURPH! HELP! HELP! Cooper: Cooper? CASE! Go! Go! Cooper: No... No air... ammonia... Brand: Cooper, we're coming! Hang in there, don't talk! Try to breathe as little as possible, we're almost there!