The simple and easy fix to ToF without making it obsolete is making it only affect grenades while in your super. Any changes made to the Melee are irrelevant to the argument about grenades. This opinion is coming from a sunsinger that runs angel of light, radiant will, and fusion grenades. (Self res and flame shield are assumed)
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I play sunsingers a lot and I laugh on anyone who use self rez + ToF+VF. Double fusion and self Rez or Radiant skin ToF+VF I roll with double fusion nades because it is by far the best sunsinger nade.