Addendum to the DF Felltower Explosive Missile Spells FAQ

I've added this to my explosive spells FAQ:

- While full cover does block an explosive spell, it has to be strong enough to resist the spell (sliding paper doors, for example, wouldn't help much), otherwise it merely acts as DR. A target's body doesn't provide cover unless it completely covers the potentially shielded victim. For example, a child or pet covered by a prone adult, or anything beyond a dragon larger than the radius of the fireball so nothing can "leak" past. Generally, assume everything in the covered hexes gets hit.