If you are entering a teleporter and the exit to that teleporter is in the same room, there is no issue of you being bumped. You may get stuck, however, if there is only a small space between the enter and exit teleporters, and that space is boxed in by, say, rope dividers. I've seen it happen. If somebody is in this space and doesn't move into the exit teleporter, you can't go into the enter teleporter. Clear as mud that explanation is! Lol, just watch before you go into the enter teleporter that somebody is not blocking the exit teleporter. Since you are not leaving the room, the room count stays the same.