"Two jars of Minerva, two jars of Pomona, one jar of Albus... hmm, another jar of Filius, just to be safe. Hagrid—no, I remember this Memory Jar contains his memory of how well I can hold my drink—" Brian stood before the Pensieve in his office, taking stock of the neatly arranged, labeled Memory Jars on the desk. He picked out a batch and set them on the preparation rack on the other side. "Hmm, since this is a meeting, I'd better only use my colleagues' memories this time. No students."
He had collected those Memory Jars filled with drifting silver mist from friends, colleagues, and a few students he knew well through Legilimency over the past while. They all contained particularly vivid memories of "Chet Brian." Of course, Brian had obtained their consent before collecting them, and rather than cutting those memories out, he had copied and pasted them.
Duplicating a memory was naturally nowhere near as easy as saying "Geminio" to a contract. The process required some special techniques, and the memory-based Ancient Magic Brian had mastered happened to be capable of it. What he intended to do now,
was use that memory-based Ancient Magic to blend together the "Chet Brian" in his colleagues' and friends' impressions, fashioning another convincing version of himself out of thin air, one who could briefly possess self-awareness and exist for a while.
As for why he was doing this-naturally, it was so he could ask his other self to attend tonight's meeting for him. Ever since learning Memory Magic, Brian had never stopped practicing this skill, which he had always believed might prove immensely useful. Everyone had moments when they could not be in two places at once and cried out in their imagination, "Please, my other self!" Today was clearly one