Rush is obviously deeply concerned by the attack on Icarus which set the whole thing off -- he was incredibly frustrated by what that attack did to his work, his attempt to give some kind of meaning to Gloria's death. He freely puts himself on the line.
I love how Kiva says that a civilian or scientist couldn't have stood up to the torture she puts him through, so she thinks it must be a soldier, but it isn't. Just an extremely courageous, tough, determined man. I was almost waiting for him to make some comment about having been tortured worse by aliens already. He sure stands up a lot longer than almost anyone else could. And even at the end, as scared for his life as he is, you still get the sense he's stalling as much as he can.
I almost felt bad for the LA scientist. Rush really is just stalling... you can see how stunned and horrified he is by the murder in front of him. Scared the bleep outta him.
Got to be impressed with Rush in this. The man has a lot more strength than anyone gives him credit for. Stuck in an impossible situation again, poor man, but I wouldn't be surprised if he has a surprise or two for Kiva and her folks even if they do force him to get them through to Destiny.