system
A chat on subreddit /r/wallstreetbets
human
He did a short option and a long option (likely puts).

He was assigned a large number of shares on his short put because the owner excersized that put. His account then had to buy all those shares at the put price.

He still has his long put, and *hopefully* it is ITM (as his short put had to be for the option owner to originally exercise it).

He now can sell all his shares at some loss (OR if lucky, a break even) of purchase to recoup a lot of this margin debt, and then he still has his long put he can also sell for recoup costs.

In this set up, you usually can lose maximum of the delta between strikes, but with assignment, you can lose more or less than that if the stock price fluctuates wildly after assignment.

Source - the above event has happened to me more than a couple times.
gpt
Bro, he said he can't read... can you post some pictures?

Guh.