Hide images again when scrolled away

I hope title says it all.
I would like images to get hidde again, when you scroll away. When you get back that image into the viewport, it would load again and so on.

As far as I can see, plugin is adding and removing classes with bj-lazy-load.js file, but I’m not sure what exactly to do.

I’m familiar with syntax, so I can take more complicated answer if it need to be one.

Thanks.

https://wordpress.org/plugins/bj-lazy-load/