Pyre's gaze fell upon a player.  You could tell a player by how they moved even if you didn't peek at their gamer tags.  In particular it was the eyes.  NPCs didn't notice things unless they were supposed to.  Further, NPCs were usually very predictable and static.

Seeing a prospective player she made her approach, hoping to lure her into the trap. Hopefully she would have some good loot that would make Toryn happy.

Pyre's name over her head if checked wasn't even yellow but a solid green, indicating she wasn't a player killer.  The thief's ability to gauge someone's power level indicated Pyre was decently pathetic as a first level mage should be. 

"Hiya!" She called out cheerfully, "Wanna party up?  I found a treasure chest but I can't quite get to it.  The monsters are too tough for me right now."