I sacrificed 2 blue Children of the Damned, 2 blue Angels, and 1 Wicker Man which was enough for a Tier 5 reward. After sacrificing, the game hung with no reward animation. After restarting the game, the toons were still sacrificed and the purple Vortex meter had gone up, but I didn't receive the reward for the sacrifice and I didn't receive the Achievement for a Grand Sacrifice.