Ok this actually happens to my friend not so long ago, he is going on a boxing match and he will bet for the heavy favorite, then suddenly an unknown guy whisper to him, that the fight is going to be fixed and he supposedly heard it from the favorite to win, locker room, are you going to listen to that and bet for the underdog.
What's your take?
I would not listen to the suggestion of this random guy.
Why should I believe him? Is he a reputed person or well known in the world of sports?
I'd rather believe my instinct to choose who is likely to win base on my own knowledge of their previous fights and ignore this guy its a waste of time to think about what he said.