I often see people fight fish ineffectively. If that person is fighting his or her first big fish, it is quite expected, happened to me too on my first big fish. A good guide will walk you through it when that happens. This is a good video reference to learn how to hook and fight a monster effectively and minimise the chances of losing it.
Peter Morse who was here recently for the Malaysia International Fly Fishing Festival 2018 gave this demonstration to guests and participants.