A retcon following Infinite Frontier establishes that Savitar, escaping his imprisonment at Barry's hands in the Speed Force, was responsible for the deaths at Sanctuary in Heroes in Crisis, not Wally as originally believed.
A revision of the narrative in Infinite Frontier clarifies that Savitar's escape from Barry's custody in the Speed Force led to the fatalities at Sanctuary, contrary to the earlier assumption that Wally was the perpetrator.