The Supreme Court may impose an indefinite sentence on the offender only where:
(a) the offender is advised at, or shortly after, the time of conviction that the court may consider imposing an indefinite sentence on:
(i) its own initiative; or
(ii) an application made by counsel for the prosecution; and
(b) the court has, after advising the offender under paragraph (a), adjourned the offender's sentencing for not less than 28 days or such shorter period where the offender and counsel for the prosecution agree, from the day of conviction of the violent offence so that evidence on sentence may be called by the prosecution and the offender.