This summary is not the rule. The rule text controls.
After a trial ends, someone might want to question a juror about what happened during deliberations, especially if they're filing a motion asking the court to change the verdict or order a new trial. This rule says a juror can't just be called to testify automatically. The court first has to hold a hearing to decide whether calling that juror (or jurors) makes sense in that situation. Only if the judge agrees, after weighing the request, can a juror actually be brought in to testify.
The rule also asks courts to keep things low-key when a juror is needed. Instead of hitting the juror with a formal subpoena, the court should try friendlier, less intimidating ways to get the juror to show up. This approach helps protect jurors from feeling harassed or targeted after they've already fulfilled their civic duty, while still allowing courts to look into real concerns about how a trial was handled.