In every scene with Hatfield, Sanders executes a bit of business, usually with his hands, that distracts the viewer from Hatfield. Sanders steals these scenes, and poor Hatfield had no idea that Sanders was out-acting him.
Sanders tried these bits in a film with Olivier, but Larry was wise to him and counteracted with his own little bits of stage biusiness.
I thought Sanders upstaged Robert Taylor in Ivanhoe as De Bois-Guilbert. I found Taylor to be stiff as the title character.