I suppose it depends on whose chart.
The flash crash was of lesser importance to us guys because price recovered, just some bots getting a good buy price it appears.
The relevant learning aspect is as usual thinking right side, were the algos programmed to buy low or sell high - clearly the former since price continued up.
What most news sites missed was the USD aspect, EURX pretty much unfazed, USDX is down.
Just a little point on charts and holidays - imagine someone short AUDUSD and his stop is 7725 and he trades UK - SL has been gapped, he now remains short…grrrr
But the US guy is happy, Boxing day? what’s that: