If any act, fault or omission of the Contractor, whether directly or indirectly, results in the delay in the execution of the works of a Nominated Subcontractor, the Contractor, in addition to his liability in respect of liquidated damages if they become due, shall pay to the Employer, or the Employer’s Representative may deduct from Interim Payment Certificates, such amount as the Employer’s Representative shall have certified in respect of additional payments or costs to the Nominated Subcontractor in respect of such delay