Test Run Video Through Motion Detection question

Long time user and I'm working on tweaking a camera setup, but I seem to have confused myself with the test run feature. When I run a video through test run it starts highlighting motion with a green box and it eventually becomes a red box (both boxes around moving objects), at which point the outside of the video also gets highlighted red.

What is the difference between the green and red highlight around the moving object?

The green rectangle indicates motion (or change in pixels) is being detected. The green rectangle becomes red when the size of that changing area exceeds the minimum object size. If this condition exists through the selected make time then the outer border of camera frame becomes red indicating criteria has been met for the trigger as configured. It should be remembered that the active profile's motion detection settings are being used for the "run through motion detector" feature regardless of which profile's settings you are configuring, or what profile was active when the clip was recorded. Also worth noting, that running through motion detector is handy and gets you closer to where you want to be, it does not behave exactly as it will in practice.