surely he could have argued his mark though saying that his group didn't do any work
i know two groups who have had someone walk off back to their home country leaving the group in a bad shape
in the first group the guy who walked off had suggested the topic they do, and it was a really hard one... pretty lame eh? :shakehead
the second group had someone replace the guy who walked off but he would be going off in tangents and his writing skills were worse than a 5 year olds...