mpr(friendly ? "\"Thank you for releasing me!\""
                     : "It howls insanely!");

        if (silenced(you.pos()))
        {
            mpr(friendly ? "It nods graciously at you."
                         : "It snaps in your direction!", MSGCH_TALK_VISUAL);
        }
        else
        {
            mpr(friendly ? "\"Thank you for releasing me!\""
                         : "It howls insanely!", MSGCH_TALK);
        }

//
// FIXME: There needs to be some sort of "dead-end" check similar to floor
//        grids, but the other way around: turning a wall into floor can
//        turn perfectly fine corridors into too short wonky-looking
//        dead-ends.

#ifdef WIZARD

#endif

        // with the original wall type.
        // FIXME: This is not optimal since it may lead to e.g. a single
        //        metal wall appearing among stone ones.

        // with an adjacent wall type.

#ifdef WIZARD

#endif

        // Rather than use old_grid directly, replace with the adjacent
        // wall type.

        // Rather than use old_grid directly, replace with an adjacent
        // wall type, preferably stone, rock, or metal.