The Seattle office is also located in a place with a bunch of different other offices of unrelated businesses. How do you know That Schmoe works for NCsoft and That Other Schmoe does not? Not to mention the first floor is all street businesses.
This strikes a chord with me because a similar thing happened during a university protest I was involved in many eons ago.
In my case though, the first group of people we were hard-staring as they climbed 4 flights of open stairs lined with students were actually there to negotiate on our behalf...
No harm done though - if anything it gave them a boost because they
knew the cold burning stares following them up the stairs were not aimed at them, but at their yet-to-arrive opponents! Gave us a good dress rehearsal too, so when the real bad guys arrived, they got a double dose of "the stare"
If there's a possibility of mistaken identity at the Seattle offices then my suggestion would be to either wear a white teeshirt with the CoH logo on it, carry some sort of instantly visually recognisable CoH paraphenalia, or even tape a printout of NCSoft's logo to your shirt. That way everyone else who works there is in no doubt who you're going after.