Chess players tend to fidget while they think. They crack their knuckles, stir their coffee, and bounce their legs. I have watched Boris Gelfand and Daniil Dubov twiddling a captured pawn in their fingers, with notable dexterity, despite being deep in thought. It’s a common tic, so when Sam Sevian reached out to pick up a piece while contemplating the position shown in the first diagram, I presume the motion was entirely unconscious.