When firing weapons with multiple attacks, models may split their attacks as evenly as possible between all enemy units within 3” of a single model, with the defending player picking which models are targeted.
I have a hypothetical situation.
Terrain blocks line of sight.
Orc fires flame thrower on brother marked with a red X. Red circle represents 3" range from him, so all of the brothers are within range of splitting. First of all, is wording "models may split their attacks as evenly as possible between all enemy units" mean that if attacking player declares that this attack will be split, does he always targets every single model within the circle, or does the defender choose which models, in addition to the marked with X, are targets?
And second, also important thing, does splitting attack negate and/or ignore cover and line of sight rules? In my reference picture, models A and D are hidden from LoS by terrain, and the rest is covered by the X model from orc LoS. It is very unintuitive for projectile based attacks, as it allows to shoot models hidden from the attacker by terrain.
You always target every single model, and any leftover attacks are split by the defender. So each BB is assigned 1 attack, for a total of 5, and the last 1 attack is assigned by the defender. Regarding models not in LoS, models in cover, etc. simply follow "the most important rule".