Explain this Tsumego solution?

The answer to this puzzle is the green dot for some reason. But if black plays there white can capture, and then every way I play it out from there white gets two eyes. What am I missing?

https://preview.redd.it/eobkwozck57e1.png?width=1004&format=png&auto=webp&s=a636bd85417c19e7324f198ae5cd594373a84241