The spotlight here, obviously, is on Hadelich. Very good playing indeed.
But listen to that piano accompaniment! It contributes equally to the expressive texture of this piece. And the piano is so Schumannesque (well, of course): plaintive, energetic, restless, Romantic. Brahms, assuredly, leaned in close to this music, absorbing some piano licks and stuff.
Violin Sonata No. 1