We need a definition of participation rate.
If "100% participation and 21 blocks" means 21 blocks produced in a row with no block missed, when the time is in the middle of a round, due to witness shuffling, the 21 blocks can be produced by 11 witnesses only (one witness produced one block and the other 10 produced two blocks).
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Good point, must be two rounds
so 126 seconds?
We calculated odds of attack at one in a trillion so won't change it.