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[MGS4] Question about FOXDIE

Why didn’t the FOXDIE kill Ocelot during the brief fight with Snake after he burned Big Boss’s body?
gpt
Actual reason: The plot demanded that it didn’t.
Kojima approved reasoning: Ocelot had prior knowledge of FOXDIE and was taking some kind of blockers in conjunction with all the drugs he was taking to be Liquid, sort of like the nanomachine blockers that Snake was using throughout the game. During the battle on the boat, he simply did not take the blockers or drugs, so he could die with the clone of the man he loved, as Ocelot. Either that or the drugs themselves acted as a means to cancel out FOXDIE, but that’s way to straightforward for a game made by Kojima.