>>106156619Since the beginning, both Harley and Booster have claimed that they saw the other one kill Wally. We saw Harley kill Wally from Booster's point of view earlier in the series and in this issue we see Booster kill Wally from Harley's point of view.
I feel like there are multiple versions of some characters running around Sanctuary due to time travel right now.
Future Harley and Booster go back in time to prevent Wally from going nuclear and fail. They get seen by their past selves.
There may also be a Wally(or multiple Wallies) from the future involved. Evil future Wally goes back in time to kill everyone. But something goes wrong and he dies(killed by his past self?). Wally goes to future to stop himself, but winds up following Evil future Wally to past,both of them get killed(?) in the present.