The line looks like this:
0_1547757139445_8d0d6121-d123-4d98-86dc-c17f86b112d4-image.png
I think that we can accept that when the green line appears, the pink line is gone. So why do you want to use both lines to detect one signal. I think it's enough to detect the appearance of the green line, or the pink line.
To see what really is going on, I can suggest to put that indicator in Trace blocks and observe it on Visual test. Some indicators repaint, they look one way and after a while they change their past and you can be very confused if you are looking at the results only after the end of the test.