When Maxwell called up some DC Heroes to take down Crusader, Fog and Purity: Wonder Woman and Green Lantern handled the former two. Superman just simply talked with Purity to convince her to surrender.
So many people died horribly around him and he faces a big decision about whether or not he should bring them back to life. Not only is he scared about what this might lead to, but is also how people see him and whether or not it's right to do. The only one who could help him in this time of sorrow was appropriately Death and it was just what he needed in one of the worst times of his life.