The fight centers on testimony from Lori Wright, Microsoft’s vice president of Xbox business development, who testified about the distinction between “general purpose” and “special purpose” devices on Wednesday in favor of Epic’s claim.

Wright’s testimony set off a day of confusion over whether Microsoft actually makes money selling Xbox hardware.

In a new filing, Apple argued that some of the documents referred to in Wright’s testimony weren’t produced in advance, and the entire testimony should fall under a cloud.

Apple has actually made this case before, arguing back in April that Wright’s testimony should be stricken from the record because of irregular document production in the weeks leading up to the trial.

It’s worth remembering here that Apple and Microsoft have been locked in heated competition for decades now, and while Apple doesn’t have a product competing specifically against the Xbox, the broader companies are tied up in a delicate balance of fierce competition and business cooperation.

Microsoft wants Epic to win this case, and it’s willing to talk about Xbox profitability if it helps to make that happen