Risk assessment: Swimming pool changing room
Hazard: hard, wet changing rool floor.
Risk of slips
Potential damage: bruises, cuts (low severity, low risk) concussion, breaks (medium severity, very low risk.
How to reduce risk: walk don't run, sensible behaviour
Benefits of activity: swimming is fun, excellent fitness, learning to swim reduces risks of drowning.
Do benefits of activity outweigh the potential for harm? YES!
He's had a minor accident. They happen to every child. I'd be worried if a child never had one because they weren't exposed to risks because they would miss out on so many beneficial and essential experiences. It looks worse because it's the face and the skin tears easily, also there's a lot of blood flow for all the facial muscles and nerves. If it was a knee or an arm, it would feel totally normal.
When DS ran into the door yesterday, it was one of those "ooh" 😖 moments. I fulfilled my parental obligations by meeting his enotional needs (hugging, kissing, reassuring) then his physical (blood coming through... get appropriate dressing) more emotional (cheering him up with laughing) then getting on with the practicalities of getting him and other children to school reasonably punctually and handing care over to school. Today he has a fine black eye which he'll probably proudly show off. There isn't a reasonable way to mitigate what happened (we need doors in the house! Constantly micromanaging not to run would be damaging to him- he may have learned from experience.... nope, I doubt it) It is just one of those things and is barely a paragraph in his life.
Every child has slips and falls. Parents can not prevent every little misfortune.