and retreats into the casing. The actual bleeding would begin slightly later. I mean it would be almost impossible for the stylus tip to have blood on it.
2. In the most unlikely event that the stylus did have a minute amount of blood AND the person on whom it was used was HIV
+ AND the stylus not not cleaned (universal precautions followed by all personnel) - it would still not transmit the virus, simply because the virus would not survive for an hour, especially in the small quantity it would be present on the stylus if at all.
Hence, no chance of transmission. Think about it, just can't happen!