If any provision of this Agreement is held invalid, such invalidation shall not affect other provisions of this Agreement and, to this end, the provisions of this Agreement are declared to be severable; provided , however , that if, pursuant to any action brought by Marshall, the release set forth in Section 6(a) or any part thereof is declared or adjudged invalid or unenforceable for any reason and, as a result, a claim covered by and released in Section 6(a) (had Section 6(a) or part thereof not been declared or adjudged invalid or unenforceable) is brought by Marshall against the Company, Mack-Cali or any of the Company Releasees, the entire Agreement shall be a nullity and all consideration provided in Section 3 of this Agreement shall be repaid by Marshall to the Company.