except that for an offense involving exclusively a nonviolent physical obstruction, the fine shall be not more than $10,000 and the length of imprisonment shall be not more than six months, or both, for the first offense; and the fine shall, notwithstanding section
3571, be not more than $25,000 and the length of imprisonment shall be not more than 18 months, or both, for a subsequent offense; and except that if bodily injury results, the length of imprisonment shall be not more than 10 years, and if death results, it shall be for any term of years or for life.