@sevmom My kids swam through high school and it was not unusual to be accidentally kicked, scratched or crack heads during practice. If you are swimming in a lane and the person behind you thinks you are too slow and you won’t move over, it’s common practice to swim over the slower swimmer. It’s not unusual to get kicked or pushed under water during the process. There is practice lane hierarchy and etiquette and some kids abuse it to get competitive advantage.
If someone is determined to hurt someone it would be very easy to do so under the guise of normal practice incidents. For instance, you could speed up to swim over the guy in front of you and land a viscous kick and innocently proclaim that the victim was too slow.