That's a lot more difficult to figure out unless we look at the pack files, I'll see if Teto found any info related to that in the files.
UPDATE: Had Teto check, no luck on protection but we did find something more based on the tags the Boss has.
Basically this cuts out most cop out methods players might try against him, which is excellent news.
no protection value? Then couldn't someone step in, and down the boss in a few crit smashes?