No risk. Conventionally, the only way that HIV spreads is through unprotected sex or needles. Shaking hands with someone briefly is not a risk
No it has nothing to do with the size of the cut. HIV isn’t capable of being transmitted that way. HIV is inactivated when it comes into contact with air
I'm just backing up the statement that this is zero risk. HIV is spread by unprotected vaginal or anal sex or sharing of IV drug needles. Air inactivates the virus. This was not a risk in any way.
I will back up everyone elses answer for you since you still seem to question it. you are at zero risk. if you both had little cuts, zero risk. yours was covered anyways. even if it was not, zero risk. you're also just making this up in theory anyways, your anxiety or paranoia is making you assume they had a cut in the first place with absolutely no reason to believe that. please try to relax and move on from this.