As part of an ongoing lawsuit between Activision and EA, an email was presented suggesting that they delayed the release of a map pack to help Battlefield: Bad Company 2.
"A couple months ago, I asked Vince [Zampella] to hold back their map pack until after we launched. (He owes me one,)" read the email according to Kotaku.
"Given that they've already made a billion, he was cool with that, obviously (Activision CEO) Kotick took it as being belligerent."
When reached for comment, EA spokesperson Jeff Brown said that the email was "obviously sarcasm".
"It's clear from the email this was a joke and they never spoke. We explained this to lawyers at Activision - who apparently don't have much of a sense of humour."
Last month it was revealed that Activision was to sue EA for $400 m (£259m) in damages after the rival publisher allegedly helped Vince and West to conspire against Activision and disrupt the Call Of Duty series.