Hope come only the saucer section is visible in the first shot, did the nacelles and secondary hull fall off?
As she skidded along, the secondary hull was sheered off hitting the shore line, the saucer kept on going, the nose was caught and up ended the whole thing.
And the "gap" is much bigger, the part of the building that Khan lands on is only really half way down the cutut, he skids some distance before the shadow of the hull resumes across the building.