The moment he swayed her hand was reaching out to his arm, steadying him as much as she could even if he had already used the statue as something to lean on. No matter how many times they argued she always would help him, dangerous situation or not. Especially if he seemed as badly hurt as he was. Each move he made to prove how badly hurt he really was only served to concern her more.
Her hand didn't leave his arm as he put all his weight against the statue, her eyes staying on him and only stopping their watch occasionally to look around them to make sure they were still safe. But then he was looking at her and she really did not trust that look. His words had her jaw dropping for a second before she shook her head at him.
"I knew you had a head injury but I didn't think it that bad. I'm not leaving you. If it gets so bad that we have to get out right away then we apparate, you just have to deal with the resulting consequences."
Not that she would leave him to deal with it himself.