Lena doesn't answer right away this time. He hadn't exactly been forthcoming with his identity back home -- and for a good reason, mind. You don't just bury a man and then bring him back. The whole idea still makes her supremely uncomfortable.

"Yeah. How'd you know 'im?"

She assumes that she doesn't actually know who Jack Morrison is -- or at least, finds Soldier : 76 unrecognizable enough from that man not to draw the connection. She has a hard time that anyone on Earth doesn't know the name "Jack Morrison" by now.