The text of the fire ball spell (p. 144 of the core rulebook) is:
Fire balls automatically hit their target. If a fire ball is fired into a group, it will hit 1D3 creatures per level of the caster. Each hit has a Strength of 3 and causes 1D10 Wounds on one target (irrespective of any armour). Flammable targets suffer an additional 1D8 Wounds.
Does this mean that one creature takes 1d10W + a hit of S3, and the other 0-2 creatures hit by the area effect takes only a hit of S=3?