During the course of the trial, the court may permit counsel to address the jury in order to assist jurors in understanding the evidence that has been presented or will be presented. The trial court may place reasonable time limits on such statements and shall permit all counsel to respond to the remarks of any one lawyer.
Tenn. R. Civ. P. 44A
Advisory Commission Comment 
This new rule gives the court the discretion to allow counsel to speak directly to the jury during the trial in order to assist the jurors in understanding the context of the evidence. For example, the court may allow counsel to make a short explanation of what legal issue the next two witnesses will address. The court is given the discretion to place time and content limits on these statements, but each counsel must be given a chance to respond to the interim commentary of any lawyer.