It doesn't surprise him that she wobbles a bit when she's tired, and he's still very careful and attentive to make sure he can catch her if she does buckle. At least here she would fall on the blanket and the soft ground though. He can't wait for picking her up for nothing but fun reasons though. (Judging by their improvement rate, she'll get better before his leg does though, even if he only had a mild fracture.)

He helps her into the chair and makes sure she's seated, then goes to grab his crutches, watching as Sherlock folds up the blanket and gets them ready to leave.