Neither participant notices her there; both are too preoccupied, although in rather different ways.

(The odds that this guy plans to let him live are... not high. He knew that the minute he saw the gun, and oh, wasn't that a surprise. But he's not gonna go down without a fight.

Not that thinking that helped him much the last time.)

The sounds they make—a soft laugh, a softer whimper—don't carry to the roof. But the emotional content is probably still clear.