Section 16. In case of the disability or necessary absence of the sergeant-at-arms of the general court 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 2 branches of the general court, an assistant sergeant-at-arms to perform the duties of the sergeant-at-arms during such disability or absence. The compensation of the assistant sergeant-at-arms shall be paid by the sergeant-at-arms, who shall be responsible for the assistant's fidelity and good conduct in office; but for misconduct or other sufficient cause the assistant may be removed by the general court