There is no doubt in the OP's scenario that blue is the effective snookering balls. You can never be snookered on a red by another red, so if one red is stopping you from hitting another on the extreme edge then it's NOT a free ball.
In the situation the OP describes, imagine taking away all the reds leaving just the one on the far left and the one on the far right. If either one can be hit on both edges then it is not a free ball.
In the situation the OP describes, imagine taking away all the reds leaving just the one on the far left and the one on the far right. If either one can be hit on both edges then it is not a free ball.
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