Is that really a thing there? That people suffering from heart attacks and strokes actually deny aid? Who the fuck ever wilfully denies aid unless it's a suicide attempt? That's insanity.
The gym employee might have felt uncomfortable entering the changing rooms and applying aid to the woman, but I'm sure the woman was a damn sight more uncomfortable in the throws of a slow and agonizing death. It's incredible that the gym employee would be too scared of the poster rules of the gym to stop some ladies memories, actions and future from being snuffed entirely out of existence, even if he's lawfully constrained, he's morally obligated, and that should precede some mundane blanket law for the situation.
It's a shame that he's been sued, but it's even more of a shame that he probably would have been sued had he saved her life as well. Sometimes people are too scared of lawful retribution to actually do the right thing, that saddens me a lot.