Wally accessing Sanctuary's files had tripped the facility's alarm, and the moment of Wally's breakdown happened, Harley and Booster were immersed in their respective virtual reality therapy sessions. Taking advantage of that happy coincidence, Wally used his powers to deliver a superspeed sleight of hand at Harley and Booster's expense. As each exited their VR chambers, he reprogrammed them and tricked the pair into thinking they had left the chambers, when in fact they had not. Instead of seeing the actual massacre, what each instead saw was the other murdering Wally.