If in proceedings on a complaint under section 146—
the complainant or the employer may request the tribunal to direct that the person who he claims exercised the pressure be joined or sisted as a party to the proceedings.
The request shall be granted if it is made before the hearing of the complaint begins, but may be refused if it is made after that time; and no such request may be made after the tribunal has made a declaration that the complaint is well-founded.
Where a person has been so joined or sisted as a party to proceedings and the tribunal—
it may order that the compensation shall be paid by the person joined instead of by the employer, or partly by that person and partly by the employer, as the tribunal may consider just and equitable in the circumstances.