Purpose The purpose of a legal memorandum is to analyze a legal problem and give an objective legal opinion on that problem. A legal memorandum is used to strategize approaches and to formulate arguments.
A legal motion is a procedural device in law to bring a limited, contested issue before a court for decision. A motion may be thought of as a request to the judge (or judges) to make a decision about the case. ... en.wikipedia.org/wiki/Legal_motion
That was Judge Walrath's denial of the first motion for appointment of an examiner - not the second one that was subsequently filed by the EC upon Walrath's reconsideration.