The italicized word (magnitude) in the sentence can best be matched by the word: size. This is referring to the size of the disaster, that it is hard to imagine something happening on that size scale.
Hello! According to this scenario Leslie needs to act according to policy. In the most polite way that she can she should show the customer the information and state the consequences. If this fails to work she should bring in her manager/supervisor to the situation.
Hope this helps! If you have any other questions or would like further explanation just let me know! :)
Decenter means to displace from the center or from a central position
--->To cause something to move from the middle
