Darbian's quest, mastering super mario brothers speedrun

The video features Darby, a world record holder in Super Mario Brothers, discussing his journey in speed running. He shares the challenges and mindset required to excel, emphasizing patience and the inevitability of failure as part of the learning process. The goal of speed running is to complete games as quickly as possible, and Darby highlights the emotional and physical experiences during attempts. He underscores that improvement comes with repeated failures, and the better one gets, the more they fail.

What does the teacher mean by saying 'I better not blow it'?

What is the expected outcome of speed running according to the teacher?