ravana slaughter line bug

did a Ravana (Hard) fight earlier and during the encounter after using what i believe was "prelude to slaughter" the lines on the ground remained permanant and would not dissapear.

after managing to finish the fight despite not being able to see properly due to overlapping effects (actual lines and bugged lines) i was riding back to turn in main story quest and i notice some fire on the mountains, i look up and i notice the ravana slaughter line effect is just chillin up in the air outside the instance.

lines are towards top of screen in the shot right under my buffs

http://i.imgur.com/0710Vtj.jpg