He didn't say it was in a swimming pool, that would be crazy. It was a "waterpark".
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(I can believe he did CPR as a lifeguard, since he's talked about it multiple times and it would be weird, even for Rick, to make up a story about letting a little girl die.)
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I assume the "waterpark" is the Noah's Ark Water Park is Wisconsin Dells, "the largest outdoor water park in the United States". Based on my googling it sounds like a real shithole where people constantly fall out of rides and sue the park for getting brain damage, but I did not find any articles about a pigman lifeguard having to sew someone's leg back on. Wish it was possible to ask Rick for clarification, but I know it would just make the AI crash and default to "enjoy prison".