Index: game/engines/default/engine/Target.lua
===================================================================
--- game/engines/default/engine/Target.lua	(revision 2637)
+++ game/engines/default/engine/Target.lua	(working copy)
@@ -135,19 +135,20 @@
 	local target_type = {
 		range=20,
 		friendlyfire=true,
+		can_pass = {projectile=1},
 		block_path = function(typ, lx, ly)
 			if not typ.no_restrict then
 				if typ.requires_knowledge and not game.level.map.remembers(lx, ly) and not game.level.map.seens(lx, ly) then return true end
-				if not typ.pass_terrain and game.level.map:checkEntity(lx, ly, engine.Map.TERRAIN, "block_move") then return true
+				if not typ.pass_terrain and game.level.map:checkEntity(lx, ly, engine.Map.TERRAIN, "block_move", typ) then return true
 				-- If we explode due to something other than terrain, then we should explode ON the tile, not before it
-				elseif typ.stop_block and game.level.map:checkAllEntities(lx, ly, "block_move") then return true, lx, ly end
+				elseif typ.stop_block and game.level.map:checkAllEntities(lx, ly, "block_move", typ) then return true, lx, ly end
 				if typ.range and typ.source_actor and typ.source_actor.x and math.sqrt((typ.source_actor.x-lx)^2 + (typ.source_actor.y-ly)^2) > typ.range then return true end
 			end
 			-- If we don't block the path, then the explode point should be here
 			return false, lx, ly
 		end,
 		block_radius=function(typ, lx, ly)
-			return not typ.no_restrict and game.level.map:checkEntity(lx, ly, engine.Map.TERRAIN, "block_move")
+			return not typ.no_restrict and game.level.map:checkEntity(lx, ly, engine.Map.TERRAIN, "block_move", typ)
 		end
 	}
 
Index: game/modules/tome/data/general/grids/lava.lua
===================================================================
--- game/modules/tome/data/general/grids/lava.lua	(revision 2637)
+++ game/modules/tome/data/general/grids/lava.lua	(working copy)
@@ -47,4 +47,5 @@
 	display = '%', color=colors.LIGHT_RED, back_color=colors.RED,
 	does_block_move = true,
 	shader = "lava",
+	can_pass = {projectile=0},
 }