Paul Thomas Anderson and Leonardo DiCaprio took time out from their busy awards-season promotional schedule for a Q&A session at London’s BFI Southbank last night. Speaking to a packed house, the pair fielded soft-soap questions of the kind that voters expect for free, but don’t sit so well with a paying public audience. Nevertheless, there were some interesting snippets from behind the scenes of their recent collaboration, One Battle After Another , notably when DiCaprio traced the project’s surprisingly vague roots .

“One of the fundamentally great things about Paul is he puts a tremendous amount of thought into what he does,” DiCaprio recalled, “and I feel like he kind of stews over ideas, and obviously that later manifests itself on screen. But I remember [first] having a conve

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