Strange. There's no teleporter there or anything. I guess your party must have stepped on a bug.

^v^:)^v^
FB

> I was on level ten, proceeding from
> coordinates 25,5 to 25,4. The hallway was
> empty, but when I moved into 25,4, I was
> ambushed by monsters that weren't there!
>
> It was actually rather annoying, as I was in the
> process of using various healing items to
> restore my party's health before proceeding
> deeper into the level. I had them moving up
> and down that supposedly empty section of
> labyrinth as they gained health from their
> magical apparel. The un-looked for ambush
> set me back a fair bit, especially since most of
> my party could not fight to full capacity
> because they were wielding Staffs of Healing
> instead of their customary deadly weaponry.
> Neither were they fully protected by their
> helmets, shields, cloaks, and boots of healing
> as they would have been by their higher AC
> equipment.
>
> This wasn't my first time on level 10... I've fully
> explored the first section of it and found the
> silver key, and I'd employed this tactic of
> moving around empty hallways to restore
> health in the past as well. Was this ambush
> by invisible forces a freak occurence and a
> bug, or is it something I can expect to
> encounter again?
>
> Grishny