The game generates a list of random numbers for each of your heroes.
For simplicity's sake, let's say that the range is 1-100.
At 90% success rate, the number pulled from the list needs to be somewhere from 1-90. If it is in the 91-100 range, it will fail.
This is probably an oversimplification of what actually happens, but basically the random number fell outside of the success range. It happens.


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