Yet revenants can start storing energy before the actual skirmish happens (i.e. before the thief starts to regain something in turn). It could be a good strategical decision not to "engage on sight", then. Assuming both start fighting at full energy/initiative, the revenant is left with 65% energy to be spent on other skills and the thief at 50% (note that the actual initiative pool is 12 if not traited).If you can't do that, you could start with a different legend, spam its skills, swap to restore another 50 and use call to anguish right away. Yes, that's why two casts of choking gas in a row translate to 12 seconds of recharge (12 initiative spent), yet two casts of call to anguish translate to 6 seconds of recharge since revenants enjoy short cooldowns. Call to anguish is actually twice as spammable in realistic scenarios while choking gas can be either "used twice before running away" or "used once every six seconds for prolonged periods of time".