I understood. Perhaps I should select my words more carefully. The dynamic elements of Halo 2 maps, such as Zanzibar, weren't even in the initial plans but added in for show at E3. Zanzibar itself was built for E3 2004. It was not the intent to add a done shield specifically to ascension, but rather the idea of more dynamic elements such as Zanzibar had in general was a tantalizing but impossible goal given the restraints the team had. Which is why I gathered from Max's reminiscence about Halo 2s dev cycle.