Pg 42 BRB wrote:
Skyfire
A model with this special rule, or that is firing a weapon with this special rule fires using its normal Ballistic Skill when shooting at Flyers, Flying Monstrous Creatures and Skimmers. Unless it also has the Interceptor special rule, it can only fire snap shots against other targets.
If your firing at a flier, check to see if you have Skyfire. If you do, use the models normal
BS. If not, its snap fire.
Pg 13 BRB wrote:
If a model is forced to make Snap Shots rather than shoot normally, then its Ballistic Skill is counted as being 1 for the purpose of those shots. Some weapon types, such as Template and Ordnance, or those that have certain special rules, such as Blast, cannot be fired as Snap Shots. It's important to note that any shooting attack that does not use a Ballistic Skill - such as the Necron Monolith's portal of exile - cannot be 'fired' as a Snap Shot.
Its by the wording of these two rules that they create an 'on/off' switch to firing at fliers with full
BS. The Death Ray is special weapon outlined by snap shots and is not allowed to be Snap Fired. With this in mind, if you declare your Skyfire rule for the shooting phase to shoot the Death Ray at other fliers, any models that are not Fliers,
FMC, or Skimmers underneath the beam path are not hit; the rules for Skyfire have stated that to hit them, they must be snap fired at. Since the Death Ray cannot be snap fired, those models are not hit. The rules also work conversely when firing at ground targets and the beam moves over a flier model.