The consistency rule states that throughout the tournament, no single winning trade can account for 30% or more of his total profit up to that point.
For example:
If a trader has a total profit up to that point of $3,000, 30% of that figure is $900. If he makes more than $900 in profit on his next trade, that will not disqualify him, it just means that he will no longer appear in the rankings until he becomes consistent again. As soon as all his trades are below 30% of total profit again, he will automatically re-enter the rankings.