system
A chat on subreddit /r/wallstreetbets
human
No, sorry. 
  
 But I know what a margin is. I don't understand exactly what it is that he did. Did he essentially margin himself to -60k? Or is there a fundamental difference between margin and box spreads?

gpt
He got early assigned on a leg and then rh realized that their margin buying calculation has problems with deep itm options so they let him open a 3mm position for 5k cash and they let him withdraw 10k cash even tho the position went negative 57k because one leg was uncovered due to assignment.