In case you didnt notice, world markets are in a downward spiral since a month due to epidemic called corona. Indian markets were following suit and "market going down" was not a news anymore.
After modi's announcement of "nationwide lockdown" (which happened on Tuesday 8 pm, in case you missed it) most experts predicted a "bloodbath" next day. That didnt happen next day or the day after.
Lets not blame the "big guys" when there is no point to make