What is the effect of submission of bill of particulars to one's filing of a responsive pleading?

Rule 12, Sec. 5. Stay of period to file responsive pleading. After SERVICE of the bill of particulars or of a more definite pleading, or after NOTICE OF DENIAL of his motion, the moving party may file his responsive pleading within the period to which he was entitled at the time of filing his motion, which shall not be less than five (5) days in any event.