Manhattan Bridge Conquest: A Zone Capture Boundary

While playing conquest on Manhattan Bridge the A point was continuously being captured. I went to defend and it was contested 1:1 by me. I looked around the whole street level and could not find any enemy players until I was killed by a player on the roof of the red brick building on the North East side of the street (from the briefing screen). Upon death the zone progress started towards the enemy again, I spotted the roof camper and suppressed them and they backed away from the edge and the zone starting progressing back to our side. This back and forth continued until the player on the roof was killed and we recaptured the point. I am 99% certain that the roof overhangs the zone boundary as it has a decorative molding at the top that extends over the sidewalk below.