if (beam.is_explosion) // beam.flavour == BEAM_EXPLOSION || beam.flavour == BEAM_HOLY)

    if (beam.is_explosion)

    if (in_bounds(beam.source_x, beam.source_y)
        && !(beam.source_x == beam.target_x
             && beam.source_y == beam.target_y)

    if (in_bounds(beam.source()) && beam.source() != beam.target()

        int     max_dist = grid_distance(beam.source_x, beam.source_y,
                                         beam.target_x, beam.target_y);

        int     max_dist = grid_distance(beam.source(), beam.target());

        while (dist++ <= max_dist && !(ray.x()    == beam.target_x
                                       && ray.y() == beam.target_y))

        while (dist++ <= max_dist && ray.pos() != beam.target())

            if (grid_is_solid(ray.x(), ray.y()))

            if (grid_is_solid(ray.pos()))

                bool is_wall = grid_is_wall(grd[ray.x()][ray.y()]);

                bool is_wall = grid_is_wall(grd(ray.pos()));

        if (!explode_in_wall && grid_is_wall(grd[ray.x()][ray.y()]))

        if (!explode_in_wall && grid_is_wall(grd(ray.pos())))