I have played the RH list that if the unit is within the building, as the building rules state you use the building for all measuring to the unit. that essentally every model is in the closest spot to the firing unit and as such can be fired upon as long as the template touched the building. but if the unit is not in the building then it cant be shot if the building interferes with the template. But this is just a current house rule locally and next to never comes up for me.
On the flip side what if the annihilators are in the building? I’m kinda certain on the answer as I would assume since there are no ranks in buildings it always strength 3, is this how everyone else plays it?