Plaguebones in DL warping at low health
 

The plaguebone skeletons in DL at the large spires infrequently warp at low health.

Their 'warp to' location seems random, and is sometime extremely far (meaning from one side of the 'concrete' spire pad to the other.

If it helps, I'm playing a necro, so they're often feared at the time. I'm not sure if that's a factor.