Not sure how to spell that level name, but I swear today someone ran under the bridge and vanished several times on me. He tried to take out my tank, I got his vehicle, he jumped out, and every time I went to find him he would vanish into the wall. It could have been lag (flak did not seem to hurt anyone), but this was very specific to him vanishing and reappearing.
Yes there is a glitch where you can go under the bridge, if that's what your talking about. I thought they patched it cause last time I tried it didn't work anymore. Not that I cheat, just wanted to see if it was patched . Try putting health packs on it. Yes it can be annoying.