Understanding a Single Transistor Flyback Transformer Driver?

I've been watching a few analyses of CRT flyback transformer drivers and can't understand why the transistor would shut off. To my naive perspective, it appears that the transistor should never shut off due to the positive DC voltage applied constantly to the base. I'm aware that this isn't the case since transformers need changing currents to induce currents in their other coils. I'm aware that the coils have inductance which dampens current buildup and charges the inductor core, but I can't wrap my hear around the transistor region.

(Reference: https://www.kynix.com/Blog/The-Complete-Explanation-of-a-Flyback-Transformer.html)

Circuit: https://i.stack.imgur.com/MIn5m.png

by Deion_Adel
November 05, 2021
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