Answer:
By using a detached and to-the-point style.
Step-by-step explanation:
Writing about his experiences in the concentration camp Wiesel used an undercooled detached style that was always to the point, business-like and deprived from emotions. The interesting paradox is that, by doing so, he created the emotional tension that seemed to be detached from the narrator, who speaks in short sentences that convey the moment-by-moment experience in a cold and robot-like manner.