If the unit is affected by Frenzy or forced to pursue because of Hatred, a non-Frenzied/Hating character must move along with the unit but does not benefit from any bonus unless he is affected by Frenzy/Hatred himself. In other words, a character does not go into a frenzy just because he is with a unit that can do so, although he has no choice but to accompany them when they charge.
A Frenzied character must declare a charge and leave a unit he is with if the unit is not declaring a charge that turn and there are enemies within charge reach of the character.
A Frenzied/Hating character that has joined a unit of non-Frenzied/Hating models causes the unit he is with to always fail their test to restrain pursuit.