it was in a harvester on a jungle map and i was happy to attract the last alien downstairs.
this map was fucked up, not only the stairs but the whole ship, the left entrance/pass and evry thing was only 1 square wide.
but its an easy win, when you get to the stairs just hide behind the wall go out shoot,hide, repeat.
Nice, that this problem is already solved in rev. 2.4.
not sure how that helps me in 2.3 unless i want to fix one problem and get another 10