TYB
How much do you know about countersurveillance techniques? Assuming you realized that you had a tail, could you shake them? And make it seem unintentional? A happy accident? Team A watches Team B while Team C watches A and B. How many teams is A aware of? How many teams is B aware of? How many teams is C aware of? Is there a team D? If team D exists, have they lost the scent?
Ask yourself a simple question. Think about time, money, resources, access, and camouflage. Would it be possible to accomplish a team's task remotely? There are surveillance cameras everywhere. Why are we really wearing masks?