Lightning Warp Totem Monster

This is a small bug.
I've played as a cyclone marauder lvl 80 at Ungerground Sea map.
I've encountered Lightning warp (LW) totem and started to use cyclone on him. I can't exactly say, did i kill him or not, but he used LW and teleported under the wood bridge. His model after LW was like as if he stayed alive
At the end of the map counter said "1 monster remaining".

Got this same issue, lightning warp totem monster warping outside the map boundary and being out of reach.
Here is screenshot showing the totem on the hole in the ground.