It could have been much worse, but the stupid mom, rinsing her kid's feet off, got the nozzle too close and removed about a two inch by one inch swatch of skin from the child's instep.
The child screaming and trying to get away from her, while she continued beyond reason to control the kid by slinging it around by an arm, not yet aware of what she had done, while three bystanders were yelling at her was kind of gruesome.
The depth of betrayed trust in the kid's eyes, I saw for many years and I have recognised that betrayal clearly in the eyes of other people from that day on. It was kind of disturbing, not so much that some random kid was injured, but the crystallizing of that emotion in my mind in its pure, intrinsic form was more than I could take without some preparation.
Actors can not imitate this expression, accurately.