WF, who was so weak/depowered that he could "barely lift his arms", was still able to destroy a world that had been hurled at them by Perpetua(god knows how fast it was moving), which then created a gateway that allowed Hawkgirl and John to return to mainstream earth.
Granted, this was evidently a sacrifice move on WF's part, but it still seems pretty damn impressive if I'm reading it right(even though I'm sure some will try to lowball, as usual)...