User blog comment:Garr9988/New Mission/@comment-24588058-20170722053653/@comment-31772644-20170722082317

I think it depends on the length of time spent in the fire. James was in there long enough to kill him five times over, whereas Artie was in an explosiuon that may have been more destrusctive, but only in a short enough burst to kill him once.

I think the trick with the Doorknob is that it's constantly killing this guy and the pheonix is constantly reviving him in a painful endless cycle. I'm sure Parry keeps a wide range of test subjects for expending, or maybe his work with the Philisopher's stone also made this guy immortal, putting three artifacts in play and complicating the effects more.