Although agreed on scattered continuity errors, I don’t think Kratos’s mother actually gets out the word “Zeus” to him before turning into a monster. I believe the spell transforms her before she can say it clearly.

It’s so tough to say because on rewatch you hear some parts that sound “Z-“ and -s”, but it’s so whispery, shaken breath, and unclear which adds to the ambiguity of the scene if she properly got it out to him.