Svencoop: Earthquake Test Center Map

I found a hazard suit room, in which a "Mad Scientist" was running around. He had the title of "monster, and had 8 health (???). There was the legendary (or not so) G-Man behind a pair of doors, which weren't accessible. I have never seen him in a MP map! Untill now, of course, but I am wondering how the maker got it to trigger him walking! Anyway, I still didn't have a weapon and eventually found a crowbar. Otis? Hmmm crowbar is in the room with otis. So I went back AGAIN through the long halls, and couldn't find what to do next. I was frusterated so I went back to the Sci with 8 health. I beat on him with my crowbar, and got him to... negative 1000 health?!? There was another scientist (a calm one) by a window and he died x.X I came up with a startling revalation: "I should get Otis to follow me to the locked door and open it!" So thats what I tried. He wouldn't follow me, so I had to "push" him, and then 2 hours later when we arrived at the door, he wouldn't do a thing! Then I wanted a gun, so I whacked Otis and he started shooting me, therefore I killed him : ) He didn't drop the gun! Time for next map to review! The other maps worked fine in this mission, although I would suggest starting at the second map, not the 1st. Have Fun! Edit: Wow, sorry if my ignorance (or lack of sleep) caused you trouble, but to go through the "locked" door, just hit it with your crowbar, and it will explode and open, taking 5 health from you. You then proceed to get a machine gun and shotgun and hordes of grunts await... Download Now!
This is the E.T.C. Sven Co-op mission. ETC= Earthquake Test Center. Well, you start off in a control room, with no mission breifing. I walked down a few hallways, with no idea what I was doing.