Well, yes, he was confusing her, but he was only trying to help, wasn't he? Arya felt prompted to say something now, when it seemed like things were only going to get worse between the two stallions. "That's very noble of you, sir, and I thank you for your trouble, but I don't think he's trying to confuse me. It's not his fault I can't follow what he says." Blithely, she delved along ahead, trying to keep things in hand. "I do appreciate your help, both of you. Please don't stress yourselves on my account." What she really meant was 'Please don't fight'. She couldn't abide bickering.
Whether or not the black stallion actually was trying to help, his words came in the way of advice, as far as she could determine. Advice was not always useful, but this time she didn't know if that was because she was simply not bright enough to follow his advice (a thought which she found rather distressing, as she didn't like to consider herself dim), or if he was just playing with her. She smiled slightly when Wylie offered to show her the stream. "Oh, thank you. I'm quite thirsty. It's been ages since I've had a drink."