It actually happened twice. The first time I could not move. The second time I could run along the ridge, but could not climbe down. It was a great place to kill MOBs from. They would not attack back.
Feylin (atys)
It often happened to me to be teleported not at teh base of the altar, but on a big bark close to it.
I rather reported it in a funny story (although OOC) there (french only)
It's the kami joke n°2.
If it's the same as for me, i'm glad not to be the only one, but you must have been really naughty so that they punish you rendering you not to be able to move. It surprise me that you would be unable to use a tp. It happened to me once to be unable to move, but I was able to use a tp if I remember right. It happened to me yesterday and I was able to move (this allows a great discovery from above :) )
I guess you can ask someone to tp at Upper Bog and duel you, so that you die and can resurrect elsewhere.
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Disclaimer: Any resemblance between the characters in this post/thread and any homins, living or dead, is a miracle.* The characters in this post/thread are fictitious. Any homin resembling them is better off dead**
*You Nazty Spy
**I'll Never Heil Again