Section 16. In case of the disability or necessary absence of the sergeant-at-arms and of the sergeant-at-arms of the house of representatives, the sergeant-at-arms may appoint, with the approval of the presiding officers of the two branches of the general court or, during its recess, of the governor, an assistant sergeant-at-arms to perform the duties of the sergeant-at-arms during such disability or absence. His compensation shall be paid by the sergeant-at-arms, who shall be responsible for his fidelity and good conduct in office; but for misconduct or other sufficient cause he may be removed by the general court or, during its recess, by the governor and council.