One sold because of the price downside, when it reached a crowded place due to supply, all his goods were sold out.
Then the second one bought as the price pumped, and when sellers came, he created a big demand saying he wants to buy a lot, the price increased further. There was a rush of sellers, but he wanted to buy so much that not everyone could fulfill his demand, so the price kept going up.
Selling in such a place means selling unnecessarily, thinking that the sellers will bring the price down. If he wants to buy so much that the seller doesn't have enough goods, how will the price come down? Only when a seller comes who can cover the price, or as long as he continues to buy what he wants until the demand is met, the price will keep rising.
Here, the exchange's auto system is handling the price, which will support it. If there are no sellers, it will sell for a little while to bring the price down so that other sellers can see and come, allowing him to create a strong demand and make purchases again.