Mysterious Building Placement

[TheProgramer]

On the co-op mission Rifts to Korhal there is two Protoss buildings that seem very out of place. An Obelisk and a Vent Access (http://i.imgur.com/Z2doH4m.jpg).

The Vent Access is destroyable while the Obelisk is not (http://i.imgur.com/i1PuJJb.jpg).

Destroying the Vent Access does nothing (http://i.imgur.com/tfiHN1D.jpg).

I tried powering up the Obelisk (http://i.imgur.com/DNXHgUu.jpg) but unfortunately it did not work.

In addition Mengsk's Palace (http://i.imgur.com/4NsMrwZ.jpg) is also destroyable but again doing so does nothing (http://i.imgur.com/4IM9Men.jpg).

All tool-tips are the same from their counterparts in the HotS campaign.

(Album of all the pictures.) (http://imgur.com/a/6Cnlt)

[KaiserStratosTygo]

That's spooky.

[Drake Clawfang]

No, it's just lazy. The Co-op missions reuse a lot of assets from the campaign.

Also, in the penultimate mission in the epilogue, Zagara's tooltip says she still "seeks to create her own swarm on Char."