Corrected entry: When Hightower approaches the window of the bad guy in the poisonous gas room, there is nothing in front of the window. He then smashes it, lifts up Sgt Lassard to get him through the window, and then you can see Hightower stepping onto something out of shot so that he can get to the window.
GalahadFairlight
24th Aug 2008
Correction: Both Hightower and Lassard step up on the chair that Hightower just used to smash the window. Even though the chair isn't in the shot, you can tell Hightower positions the chair against the wall.
Bishop73