Duo wants to reach up and sooth Sheik's hair as a show of comfort, but he knows that'll just make him more tense. Instead, he starts pulling and proding his wrist as before. It's probably the best thing he can do for the sheikah. If he can play sooner, he'll be able to relax sooner. His scythe remains propped against his shoulder as he works his own stiff fingers into Sheik's skin.