Strange brand behavior

[grindorin]

My Zulgor priest just acquired a branded weapon recently, and I've noticed that when the blow kills the opponent, the brand still let's off a bolt-like spell. Stranger still, is that this spell appears to be targeted somewhere left and up from my character, regardless of which direction I was attacking.
*EDIT*
After further observation, I would guess the spell is targeting the upper-leftmost space in the dungeon. If I happen to find an empty, arena-type level, I will test further.

[Variaz]

Hmmm, the projection is supposed to be just on the space of the monster, it's not even supposed to be a bolt...hmm.. I may have forgotten some flags or something... or something may be wrong. First time I get informed of this also...

[grindorin]

My earlier observation was correct, the spell attempts to target the top-left corner of the level.