Invisible enemies (all the same)

[GlassGo]

So, all happened exactly like in this http://forums.te4.org/viewtopic.php?f=4 ... 11#p203311 topic.
Except I have found some tile that hurt my char badly.
From the log it looks like it is mob that gone, this is effect from Beyond The Flesh.
Mob's name is Velinn manaworm.

So basically it is looks like near some tile char got attacked by BtF effect.
Log shows that mob. I didn't met it. Didn't killed it.
If isle got teleported, mob stays on same place (I believe because isle becomes clear).
No addons.
So?
Saves?

Sorry don't know how to hide screenshots.

PS Created a ticket with save.