I still remember the day when I entered SOXL at $33.88. And several ET members produced nice charts to show me that, do not catch the falling knife..... Nice.
I'm not saying that they were wrong. But I've heard of such rule for more than 20 years. Trading rules are not hard set rules. Or the broker rules that we can't violate. Or account will be closed. Rules have no brain to think. Yet human have brains.