If I'm going to backstab somebody or disguise as the opposite team, I usually go to their spawn and brown townyze their movements. Where do they go more often, how many people go this way, or that way, how many of each class do they have, etc.. I use this data to make an evaluation on whether I should disguise and follow a large crowd or pull out my Eternal Reward. Usually, it's the latter, because I'm bad at fitting in with my disguise.