The volatility index tends to rise usually contra to Nifty. Currently at 21 has caused large red candles in hourly time frame today, further upside could be more lethal. A daily close above 22.50 will move it towards 24 and above that towards 30. A rising VIX suggests intra day moves get vertical with gap openings. Getting caught on the wrong side can cause massive m2m damage. It usually cools off after a correction or at an event - since we are into Q3 results - large cap noes and Budget on Feb 1 are some factors to be kept in mind.
PS: This is not a suggestion to go bearish, just a suggestion to cut down on exposure