I love the whole 'divide by zero' response! oh Gawds noes!
Drop the apocalyptic barrage template on centered on the contact point, roll 6 times, and remove anything contacted by the barrage rolls...included SH/GC's...and wipe the map flat (terrain). Leave the template there as difficult/dangerous terrain (molten slag/warp bubble overflow/'it's the ra-diation') and keep on truckin(straight upward vertical pull/discharge for flyers too!)