Not relevant to thread but advice I found worked for my little lemmings was to (assuming it's the double ring that is often killing people) wait for the second opening on the first of the double rings - this will put you in a perfect position as the second ring comes in to easily avoid it without any fast movement or reactions at all really. Just don't get them to go for the first opening because if they're bad at moving the second ring will likely hurt / kill them. In p2 the double ring is immediately followed by the dropping orbs, so make sure people handle that after.
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ceall during SoO we only had 2 flexi mechanics over the entire raid - the vast majority had fixed breakpoints, although different bosses had different points (some 10-15-20, some 13-18-23, etc)