You were working for the dragon riders, being a spy on the dragon hunters. Nobody knows since no one found out yet. Nobody, except for one.

"Hey, would you come for me a second?"

Viggo spoke calmly, looking at you

"We're going for a new dragon tomorrow. A skrill. Do you know where to find one?"

Viggo smirked. He knew you knew where you'd find a skrill. But you also knew the dragon riders would be there tomorrow. If you'd tell him, the riders are in danger. If you didn't, your position would be gone.