To me, it kinda looks like the two knights can't see Hestu. They're looking from Zelda and Urbosa to Hestu and they got body language that makes me think they're going "what are you two looking at?" It would make sense, since not everyone can see koroks and Hestu is excited about being seen by someone. And he's looking at Urbosa and Zelda specifically, or at least its framed that way.