Why YES Bank, DHFL did not hit lower circuit limits on Friday?

Here is a lowdown on everything you need to know about circuit breakers/circuit limits.

Equity market witnessed a roller coaster ride on Friday with stocks across the board falling like a pack of cards. The S&P BSE Sensex saw a jaw-dropping 1,500-point swing, while shares of YES Bank and DHFL, bled a whopping 34 per cent and 60 per cent, respectively in intraday trade before recovering a bit.
 
However, the trend left many of us thinking why these stocks did not hit lower circuit limits, like it happens usually. Also, what are circuit filters/circuit limits, what are its significance and how do they work?
 
Here is a lowdown on everything you need