Aww...At this point I just want to yell at Lois for not picking up on all the signals that Clark is The Blur!! I guess I can't blame her, though, since they do seem like two completely different people.
When she said the Blur put the fire out in three seconds and Clark said two seconds and Lois said ya. I mean come on like that wasn't obvious he was the Blur even she knew it and she knows she did. She knew Clark was the Blur when he first became the Blur. They just wanted us to think she didn't know he was the Blur but she really did.