Before in a team, and engi got his sentry and blew him up, above a shed near the robot’s entry point. I don’t know what happened next, but he ended up WAAAAY above the map, on some invisible floor! From there you could walk behind the barriers, and go over to the tanks and such! He built a Tele up there and everybody enjoyed!

He said he learned it from a demo man who did the same thing.

Other than that I’m clueless how to do it again, and I seem to be unable. Anyone know how?