ARNA Ichimoku Clouds

Playing Trading Simulator Game:

Viewing ARNA 1 hour chart with Ichimoku Clouds.
Price crossed down and through green cloud on 11JAN18.
Cloud color changes from green to red on 17JAN at 10:30 am.
A possible buy at that time.
Wait and watch.

Komentarz:

The above statement is incorrect.
Ignore the cloud.
Price crossed down to the underside of red line
meaning that the price is likely to decline.

Komentarz:

Stock has since then gone down then up then down again.
Yesterday, on the 1 hour chart, the price again crossed down to the underside of the red line meaning that the stock is likely to continue it's decline.

Komentarz:

BTW: The red line is called the base line...
of the Ichimoku Cloud indicator.
I'm still trying to understand it.