Need some clarification on Current Limiting Fuses

I know it sounds redundant but that is part of the confusion. I work for a utility and I have asked this question to a few people but seldom get a straight answer. For a little context, on our primary system we use both expulsion type fuses and the CLF’s to protect assets. Now I have a very good understanding of the operation of both types and why we use them separately. But why feel the need to use both in series? It seems a little extra. I get the CLF limit fault current, but doesn’t the E-type already do that by, well, blowing?

TL;DR What benefit do you get from using both CLF’s and Expulsion type fuses in series to protect assets?