What's the exact wording of the rules for it?
Death ray: To fire the death ray, nominate a point on
the battlefield anywhere withm the weapon's range. then
nominate a second point within 3D6" of the first. Then, draw
a straight line between the two points. Every unit (fnendly or
enemy) underneath the line suffers a number of hits equal to
the number of models in the unit underneath the line. If the
vehicle's other weaponry is fired in the same shooting phase,
it must be fired at one of the units hit by the death ray.
From what I understand you can use this weapon to shoot into assaults and/or kill your own models with it.
What happens if I destroy 1 single model, say a lone Warrior or something. Could that potentially grant me First Blood?