// wandering through a trap is OK if we're pretty healthy, or
            // really stupid.
            if (trap_at_xy(targ_x,targ_y) >= 0
                && mons_intel(monster->type) != I_PLANT)

            // wandering through a trap is OK if we're pretty healthy,
            // really stupid, or immune to the trap
            const int which_trap = trap_at_xy(targ_x,targ_y);
            if ( which_trap >= 0 &&
                 mons_intel(monster->type) != I_PLANT &&
                 monster->hit_points < monster->max_hit_points / 2 &&
                 (!mons_flies(monster) ||
                  trap_category(env.trap[which_trap].type) == DNGN_TRAP_MECHANICAL) )

                if (monster->hit_points < monster->max_hit_points / 2)
                {
                    good_move[count_x][count_y] = false;
                    continue;
                }

                good_move[count_x][count_y] = false;
                continue;