Be Careful What You Wish For...(PLO8)

[niss]

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if you had raised this flop, you'd have a good chance of folding out baby flush draws. as played a non-nut flush might not be folding at all.

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This is the same thing I thought when reading the OP. Another benefit of raising is that A-2 with spades may re-raise, which would be a sign that you are in big trouble and would make it easier to get out cheap.