However, he quickly realized that from time to time he needed to prepare a presentation, and unfortunately, as was the case with some of the most important issues, had to do it by himself.
He never realized that from time to time he needed to prepare a presentation.
mnli hypothesis: He never realized that from time to time he needed to prepare a presentation. premise: However, he quickly realized that from time to time he needed to prepare a presentation, and unfortunately, as was the case with some of the most important issues, had to do it by himself.