fisrt of all, here is no casting bar when you are using that flame.
even this WC (press the link) with his cov, bw set and 3 wit dyes has casting bar, but our WCs dont (press the link).
secodnly, here cool down is one second. On l2 central is 5, but on all videos is 3 seconds at least, not insta-cast like here.
hope these will be enough.