Whenever any ship or vessel shall be libelled as aforesaid,¹ the master, owner or consignee of such ship or vessel, or his or their agent, may appear in the court in which the libel may have been filed, and enter into stipulation, with sufficient sureties, to answer such demands as shall have been filed against such ship or vessel, and thereupon such ship or vessel shall be discharged from the arrest: Provided, That no ship or vessel shall continue to be chargeable for inward pilotage, or for any penalty incurred as aforesaid by the master of any ship or vessel, longer than the time which shall intervene between the performance of the service of inward pilotage, or the neglect or omission incurring the penalty, and the departure of such ship or vessel to sea.