Glitching the combatlog?

How does this happen: https://www.warcraftlogs.com/reports/wMm4JBWqTyr9VFXD#fight=1&type=damage-done

1:15 min fight? All got a 100 log. It seems like they’ve been glitching the program sort of? I don’t find it fair for the other ones that a pug grp of 20 people should get a 1:15 min kill on HC Argus.