Show line path as different color when both points are out-of-band/bounds of threshold

[mdchristians]

I'm having some issues trying show a line chart with both upper and lower bounds. The line is suppose to change color if it goes out of bounds as soon as it passes over the band. the issue comes when I have a path that goes from the high out of bounds to low out of bounds where it should be red all the way through.

I've tried a few ways of doing this and for the most part I can get a chart very close using one of the following:

1. Area and SplitLinePath
2. Thresholds with multiple line paths for in and out of bounds data points

There also might be a way using LinearGradients with stops but i believe that would also cover up a high-to-low path.

What's the most efficient way to get about creating a chart? Any help would be appreciated!