So, you might be asking yourself: "What was up with that colorization action on the 'copter?!" Well, you might be asking yourself that if you are weirdo like me.
It fills with a Black/Green dither, and then manually draws magenta lines over the black to get a "manual" Green/Magenta dither... A natural question to ask is "Why didn't it just fill with Green/Magenta in the first place?", something if you look at the "spec" for SCI0 and ScummVM/other-implementations would allow!