When Burry “side-pockets” the credit default swaps, that basically means that he temporarily prevents his clients from withdrawing money. Normally, investors can pull money out of a fund, but they can’t touch money Burry has side-pocketed. Obviously, this is a controversial move (and is intended to only be used for emergencies), which is why even an early supporter like Joel Greenblatt begins to question Burry’s choice. (Later, Greenblatt claims that he only asked for money from Burry because he was facing similar pressure from his own clients that were trying to withdraw money.)