As Thom02099 pointed out, we would NEVER enter running water like that - we had no way of even knowing what was under it. I am guessing the man leaving through the flooded entrance made a calculated decision to get the H*LL outta there.
I was surprised the managers wanted that type of liability... they were actively demanding people stay and drive into flood waters to access their campground. As we walked out we saw young kids running less than 20 ft. from fast moving flood water. It was crazy dangerous and the parents were allowing it. just clueless on everyone's part.