I only know it's a process of change of matter but I don't remember the exact types
It helps the person get closer and communicate with that person at face value. Working together strengthens the bond.
Tom is most likely making a Remouillage. It is French for "re-wetting." It is stock that was made from bones that were already used in a previous stock. It is also known as "Second stock." The bones would be re-simmered and fresh mirepoix added. The result of a Remouillage will not be as clear as the original stock and is a bit weaker.