Stuck in extraction mission after killing all aliens and bringing VIP to SkyRanger

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I seem to be stuck in an extraction mission (rescuing some general) after (seemingly) killing all aliens and bringing the VIP to the SkyRanger (to the marked area).

I think I killed all the aliens, but there may be some others hidding somewhere. I've swept the area twice but could not find the missing aliens. That happened quite a bit on the original 1994 game, but I thought I read somewhere that the developers got rid of this situation in the latest version somehow.

I'm in mid-game playing in normal difficulty (no ironman mode) and the PS3 version. The mission is in Brasilia, Brazil.

What am I doing wrong?

Best Answer

Well, during my sweeps I wasn't going near the jump point of one Thin Man. Since he wasn't on the map, he wasn't making any noises either. Once I got near that point, the last Thin Man just sprang out of nowhere, as usual, and I nailed him with a plasma rifle. That ended the mission as the VIP was already waiting at the extraction point.