By wall I believe he is referring to the slurry wall, aka the Bathtub. I also think the building that he's commenting about is actually WTC 6, which was pulled (down) a couple weeks later.
Of course, that doesn't prevent a lot of excitement over at the Looser Forum and 9-11 Blogger. But in fairness quite a few people even in those places see this as much ado about nothing including Dylan:
Kerry was simply stammering and said what he could to sound like he knew what they were talking about.
Update: That's what I get for not checking whether my co-blogger has covered this already!