"Cold Blooded can be devasting if you choose at least two skill-rune pairings that chill or freeze your targets. Use it in conjunction with Blizzard, Ray of Frost, and Frost Nova for maximum results. It's ideal to use during co-op play on higher difficulties. Focus on freezing and chilling as many enemies as you can while your allies deliver the AOE damage to take advantage of the 20% extra damage the affected enemies will receive."
So, I've looked around and people say Cold Blooded passive only works for the wizard, not their allies.
Yet the book implies it works for allies.
Can I get a confirmation on which is true?