How we cite our quotes: (Act.Paragraph)
Quote #4
We don't have a chance in hell, Domin. This feels rather…like…death. (2.25)
Hallemeier realizes that they have no chance against the robots, and comes face to face with his own mortality. And not just his mortality, but the mortality of everyone everywhere on earth—the end of the human race. No wonder he uses a bunch of ellipses; that's heavy stuff.
Quote #5
FABRY: Do you smell death?
HALLEMEIER [satisfied]: They're fried now boys. Absolutely charbroiled. Haha, man mustn't give up. (2.79-80)
The death they smell is the death of robots, who earlier in the play weren't able to die. Robots here seem to be made out of flesh, more or less, so their death smells like humans dying. And of course robots want to live, so killing them is more like killing a human than like shorting out a toaster. Killing people may be necessary, but laughing about it is sort of gross.
Quote #6
We've probably been dead a long, long time and have returned only to renounce what we once proclaimed…before death. (2.81)
Domin isn't exactly facing death with brave fortitude. Instead, he seems to be falling apart. The approach of death makes him realize that he's always been mortal—or, in other words, he's always been dead.