At the moment slashing a player frozen in ice to free them results in no audio or video cue at all that you've helped free them, they just become magically unstuck. You might think this is okay but with lag people can easily assume this is related to lag and that the player was frozen for long enough to thaw out naturally regardless.
We need it so that when freeing a player a soft (yet notable) sound of ice smashing or melting (in a frying pan for instance) when a player frees someone from Ice. Also there does not appear to be any feedback when ice deals damage to the player when the player thaws out naturally leaving other party members to not even realize your being hurt by the ice.