They were frightened in Jedha when they were jostled by Death, so they fled. Death, it turns out, was surprised to see them there in Jheda, because he had an appointment with them in Tatooine.

Yeah, it was distracting and made no sense, but you know what? Walrus Man. One of my earliest memories is of holding a Walrus Man action figure in the sandbox at daycare. And now here he is again. Glad to see him.