Both wounds would have to be so deep that neither of you could stand the pain of having that deep wound thrust that far into the other person's wound, and that would only be a theoretical risk. Since you just had water and blood rubbed against it, so the virus was effectively long dead from being outside the other person's body. Move on from hiv because millions of people share blood from cuts every year and no one gets hiv from shaking hands with someone else who is bleeding.