Yeah, that invisible wall is a magic bulletproof barrier on both sides of the wall. Could be a collision mesh issue. One thing to note is that kind of wall cover on the roofs of PR buildings are not in vBF2. So I imagine the devs created these low wall statics for cover to use in conjunction with the vanilla buildings.
Reasonably, I'd be able to shoot at the Insurgent or British soldier poking his head out, so I fired a
lot at this one person. Thinking it was poor aiming on my part, I continued firing, waiting and firing and eventually gave up.
Instead, I got close to the building and chucked a few nades up there.

Some funny dialogue going on in the squad, by the way.

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