5/10 I know he's FOS, but do I still have to fold?

[Gobgogbog]

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I call a lot of donkbets when they come from unexpected places , but I don't really know what to make of the UTG limp by a 21/14

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utg was a bad player he folded the flop
bb is the 21/14

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Guess I need to read more carefully. I think he's FOS and I don't think you have to fold.