You will now be able to get Ammo Packs and Frags for every Assist you deal minimal damage to: HM (Humans), SV (Survivors), F.ZM (First Zombie), ZM (Zombie) and NM (Nemesis).
The damage needed to get a Assist is: the health divided by three. That is to say:
– If a Zombie has 4,000HP, you need deal an damage of 4000/3=1,333HP is needed to get a Assist.