Wow, anybody looking at the ES book, 1s and 2s, crazy. I've only seen this a time or two...Aug 23rd or 24th a few years back, brexit, recent election night. ES trading like the dax. Hope everybody is staying safe out there. You can lose your entire account in a day. Best of luck.
If volality jumps 10 fold the book tends to thin at least 10 fold. Personally if the ATR jumps from 10pts to 100pts i cut my size to a 10th of what i was trading as well. I guess most others do to. Now if someone only ever traded 1 lot in the first place they got bit of a position sizing problem. I suppose they could switch from trading ES over to SPY, but will need more margin.