They still made him sound shitty this episode by having him give his position away right from the start. In his defense, he was surveying the most heavily guarded areas so maybe Tatsumi wasn't even being looked at.
Lubbock's survival rate may very well be due to his low combat rate. He's usually on recon roles to warn the others so he picks up and avoids enemies. He wouldn't even fight this time round if the spy hadn't been a girl. As for the fight itself, that was pretty cool despite being a pretty close call.