Mechanism for the CBS reduction?

I don't get the CBS reduction of ketones in organic chemistry. I can draw two ''chair'' structures for the reduction of phenyl,methyl ketone and each gives a different enantiomer. Both have the phenyl equatorial, I don't know what I'm doing wrong. Please, help.[![enter image description here](https://i.stack.imgur.com/vBKn2.jpg)](https://i.stack.imgur.com/vBKn2.jpg)


