So let's say Leudigar, Zem, and Zax could surprise attack if they wanted to, but if Leudigar (in front) tries to step inside and drag a monk back thru the door (which I'd run as an overbearing attempt), he will block the others from rushing in.
Akbar could, in theory, fire one missile in the surprise segment. However, he can't fire through the doorway and into the room from his starting position, perhaps 15-20ft from the door in the passage way. Moreover, he can't really see a target without advancing to the doorway first; and he can't do that unless the three in front of him either go in, or move past the doorway.
Approx mud map: