I actually wondered about this when I first saw the pictures. I boxed competitively for years and have seen and suffered many broken noses. In my experience they bleed like a faucet and get very red and swollen within minutes. I would have expected to see his shirt drenched in blood and a very red, swollen nose. But I’m no doctor and there may very well be types of hairline nose fractures that don’t display these characteristics.
Kobe Bryant suffered a broken nose in the NBA all star game. Very little (if any) blood. No deformity of the nose. The only clue was is expression of pain at the time of injury and the next few games he wore a protective mask.