Not sure if this is a bug or intended.
When I cast colosseum the ring of fire always casts at my feet, rather than the enemy that I teleport to/cast it on. When enemies (centaurs or whomever) cast this, the ring of fire always seems to cast where they teleport to (usually on the player) which seems to be how the skill was intended. Having the skill cast at your feet, rather than where you teleport to seems awkward as most of the time the ring of fire is never around the enemy that you are attacking. Is this intended?