Stuttering, suddenly proclaiming knowing various things about her, and claiming that they could see 'levels' and 'classes' above people's heads just sounded completely crazy and was not helping Mike sound any less suspicious. If anything he was even more suspicious now in Sumi's eyes. 

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Mike Negotiation: 41 - 11 Negotiation + 25 for sounding REALLY SUSPICIOUS = 55
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Mike sounded reasonable enough, but the way he worded various things and suddenly spoke while sounding very nervous. Sumi didn't know anything about video-games. She never actually played them, not that the Gamers knew this, so to her this talk about Levels and Classes was all just a bunch of crazy gibberish. So naturally Sumi wasn't buying Mike's sudden explanation of why they approached her, not at least without some form of explanation as to how in the hell they knew who she was. Of course Mike suddenly mumbling something beneath his breath, as he would have had to speak to use the Observe Skill and mumbling would be the only way for Sumi not to catch on, was also not helping his case either. 

"For someone who hasn't spied on me, you seem to know alot about me. Start explaining who you are before I pound it out of you". Now her fighting stance was full, the yellow glow around her fists growing a little more intense as her name above her head turned red. The text above the heads of the Imps were also red, this signifying that she was now hostile. Of course she was also human and intelligent and she was giving them one more chance to explain themselves before she decided to let her fists ask for the explanation, and fighting someone nearly six times one's level was suicide.