But, yet, if you assume that the bridge wasn't obscured, then that's precisely what happened. Where's the debris, Alyeska? The asteroid strikes the port side of the bridge... the starboard side, according to your explanation, "disappears".ISD bridge's don't suddenly disapear.
The way you're describing events, it is simply NOT POSSIBLE for there not to be any debris readily visible. If the asteroid were sufficient to rupture the armor and structural support of the ISD tower, the starboard side of the bridge should have been flung towards the camera. Yet it was not. It was not visible anywhere.
Ergo, the final conclusion: "It was not visible". A huge plume of black dust is seen obscuring the rear of the ISD tower, which is only visible because it has the backlight of the SSD's engines. The forward part of the dust cloud has no back light, and thus is indistinguishable from the normal blackness of space. That is why the tower is not visible.