Freeze stops enemies from attacking. Burn gets rid of Freeze, but not the other way round.
For hailstorm the freeze is separate for each enemy, that means some enemies could be frozen and some could be not, NOT 50% chance to freeze all and 50% chance to freeze none If possible make Ice-ification turn you blue coloured. Its meant to turn you INTO ice, more prone to shattering but having sharp edges that cut enemies