I had reaper's blade on a champ, the champ had no atk, I tried attacking an opposing champ with RD, the deflection animation came on, no zero was dealt. According to the wording in RD, the attack should only be deflected if damage is dealt. My champ had no atk, so no damage was dealt, but with soulstrike, the opposing champ should have lost 25% of their hp, which did not happen.