He guessed it

A man with short blonde hair and a black jacket looks upward with a pained expression, then the scene cuts to a man with long dark hair and a black and white suit looking forward with a serious expression, followed by a close-up of a memorial plaque with a photo of a young man and text identifying him as Bucky Barnes, 1917-1944, and finally a man with a beard and a black cap looks forward with a somber expression.