Judging from the number of individuals, her vocal presence, and the fact that the group was following her orders, Izroth believed that the young woman with sapphire eyes was a 10-Man Squad Leader.
While this may not sound as impressive as his Captain's rank, one had to remember that the war event had just begun a few days ago in-game time. Acquiring a command position so soon meant that she was no pushover.
As for why she did not recognize Izroth's player name despite him still being placed first on the event leaderboards, she was simply not close enough for it to appear through her system interface.
'There are more important matters to attend to. Still, they are allies, and killing them here could negatively affect my contribution points or rank. I suppose I'll have to use a more gentle approach.'
"We are not your enemy," Niflheim said; however, his words fell on deaf ears as the group pressed forward with their assault.