When fighting with sorcerer who creates flame, there is a visual bug like on a screenshot below bug. When he (sorcerer) creates this flame, and you teleports away, this flame stays at this place inifinitely, even though not doing any damage. This bug can be repeated several times.
EDIT: seems like this bug could occur not only if you teleport. Happened to my friend too, but there was no teleport - he was just running away from the elite.