Sarah slips out of her shoes so she can slink more quietly after Heather, and man, she is so sexy even when she's not trying. She asks Heather why she did it and Heather says she only married a geek because he'd get rich, but he wasn't ambitious enough, so she found the Russians, who offered a lot of money. Which ... sort of implies she's not the boss, but just working with or even for them. So, again, I think she wouldn't have been the person to order those guys to kill Mark and Chuck. That was probably for effect, so that we'd see how very bad she is, but it rings false to me. Anyway, Sarah and Heather fight, and Heather is unbelievably, stupidly strong, knocking Sarah around and getting away. While the girls are in the locker room fighting, Mark's reliving his high school nightmares as the Russians shove him in a locker. Poor Mark. He'll never escape this fate, will he? They say they'll shoot if he doesn't tell them where the plans are. Casey shows up and shoots one guy, then fights and kills the other. Mark's calling for help from Agent Carmichael. But Chuck's spinning records, putting on "Smack My Bitch Up" just in time for Sarah and Heather to head into the showers and tear the pipes off (with little effort, natch) so that there's water soaking them as they fight with the pipes. It's very very cool, even though one of the two people involved is Nicole Richie. Heather tells Sarah she should have suspected her because a girl like her would never fall in love with a dorky nerd like Mark. Sarah's all, "You'd be surprised." Because she's totally in love with Chuck. Can we just have them get together already? Back in the hall, Chuck walks up after Casey's taken care of the Russians. Mark comes out and credits Agent Carmichael with saving him again. Casey's starting to get annoyed. Hee.