From what I saw, it looked pretty clear that the clerk pulled down the guy's pants. It's hard to say what happened after that. I can speculate from my own experience that the clerk probably made it the guy's fault that his pants fell down and started threatening him. The observation that the guy didn't pull up his pants right away indicate to me that there was some heated exchanges going on. The fact that the cops arrested him so quickly and added the disorderly conduct charge on top of indecent exposure could be attributed to -- OK, I'll say it -- his race and the location where the harassment took place.

I say "from my own experience" because my jeans have almost fallen completely down during my last two gropings at IAD. I'm a runner and have a pretty slim lower body. Jeans, even ones my size, don't tend to stay up very well on a slim waist without a belt.

Last week, the clerk ordered me to place one finger inside one belt loop on each side (literally were his orders) and hold up my pants. I suspect that the TSA is so paranoid about accusations of performing strip searches that clerks have explicit instructions about how to deal with wardrobe malfunctions -- one of which is to make sure it's the passenger's fault.