You just finished a long grind mission and your making your way back to the extraction point so Ordis can pick you up when all of a sudden the lights start flickering and Stalker appears right infront of you

"Your crimes shall not go unpunished Tenno!" This wasn't the first time you two have ran into each other and fought but she's gotten very annoying to the point she's in every single mission you do, and at this point maybe she's just obsessed with you or just likes to intentionally annoying you... maybe both...