Did he normally look that thin? Maybe it was just starvation.
I can't explain the green spot. Maybe someone else will come along who can.
We many not ever be able to say for sure what happened. I would say the priority at this point is making sure your other BP's care is correct and they are doing well.
The most basic requirements that need to be met are temperature and humidity. Once you have those stable then you can move on to other issues.
Hot side 88-92 degrees F Cool side 78-82 degrees F. The cage should stay in these ranges 24/7/365.
Humidity 40% - 60% normally, 60%-80% during shed.
I would recommend picking up one of these for each cage. They measure 2 temperatures as well as humidity. They cost $12 at walmart:
http://www.walmart.com/ip/Acu-Rite-I...ndingMethod=rr
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