the scene in the trailer was probably re-shot.... because there's a similar sequence when Anne screams from seeing one of her colleagues drilled by a spear and King Kong's response to that...... and as Kong howls, I think the same shot you see in the trailer of the camera soaring backwards into a super-long shot of the island still remains.
If it wasn't re-shot then maybe it was a completely different sequence altogether that ended up in the cutting room floor made to think it was one and the same in the trailer through the use of editing...
You're the first one to bring that up, though I'm sure I did and others did notice it missing from the film...