Strange clouds on the Fleep Ship mob

[Elgrablyx]

Some strange clouds coming up from attackble mob of the Fleep Ship hall , is it a bug?http://uploads.tapatalk-cdn.com/20160322/d8219c438aa9b73e2e6bdbc7b2c89524.jpghttp://uploads.tapatalk-cdn.com/20160322/caa6949c3628dc02c5af228837efdb42.jpg

[oekeone]

its when u add 10/10 on masteries on clock skill

[Platfarmer]

This is the clock mastery , its not a bug since the npc is a dummy for fun