2b Theatre Company makes is Spoleto Festival USA debut with When It Rains, play in the form of a live-action, existential, graphic novel. When the improbable happens, two couples are beset with misfortune, communication fractures, relationships crumble, behavior becomes absurd. Some kind of God intervenes. Or observes. Or something. Or nothing. Playwright and director Anthony Black unpacks some of When It Rains for Jeanette Guinn.