The war of words between Activision-Blizzard and Electronic Arts has moved to a new plateau. Activision has added the rival publisher to its $400 countersuit against the creators of the “Call of Duty” franchise.

A Los Angeles Superior Court judge approved the amendment to the suit Thursday, acknowledging Activision’s allegations that EA wooed Jason West and Vince Zampella, the heads of the wholly-owned Infinity Ward subsidiary, while they were still under contract with Activision.

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