Duplication - pick a healthy mob, target it, and \"/cast freeze\".
Upon success, you\'ll watch the HPs tick away, almost as expected... 100, 99, 98,97,96,95,94,93,92... 100. No matter what, if freeze is the initial shot, its effect will be \"never happened\" when the DOT wears off.
Once you whack the mob via other means, the DOT\'s effect seems to persist... but any time the mob\'s health is 100, the above behavior occurs.