"...I mean, you could just. Not." Cyrus shrugs, drinks. "Keep her from getting herself killed, I mean."

There's a strange quality to Cyrus' tone. He's half-smiling, like he's joking, but the joke isn't on Molotov, or even the idea of her death. No, it's on Stephen - on his concern, his investment in keeping Molotov alive. Cyrus speaks like he's poking fun at Stephen for getting too emotional over a movie, or giving someone he admires more attention than they're giving him-- like he expects Stephen to laugh along with him.

Also: He's only half-joking.