In medias res is a latin phrase meaning “in the midst of things.”
It's used as a literary term to describe when a story opens with the character already in the middle of thing : like sometimes they start with showing as epic battle or it's aftermath and then say " you must be wondering how I got myself in this situation. for that we need to go way back.'
The independence of the judicial branch is ensured by making sure that the judges cannot receive a reduction in their salary and cannot be removed from the bench by a president who might oppose the judge's views. This gives judges a security in their job that allows them to make decisions without worrying about political pressures.