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We know that the Strogg in Quake IV recruit their solders by "stroggifying" (i.e. assimilating) their captured human enemies. However, I don't recall them doing so in Quake II.

Was that plot element introduced in the sequel (Quake IV) or were they supposed to have been doing this already in Quake II? If this was new behaviour, how was it motivated?

We know that the Strogg in Quake IV recruit their solders by "stroggifying" (i.e. assimilating) their captured human enemies. However, I don't recall them doing so in Quake II.

Was that plot element introduced in the sequel (Quake IV) or were they supposed to have been doing this already in Quake II? If this was new behaviour, how was it motivated?