The police can ask as many questions as they like, even after you say you won't answer them. Its up to YOU to not answer, the police have no duty to keep silent, that is your right.
FYI It's ok to follow anyone at any time, you do it every single time you drive your car,or walk down the street. If you think that is provocation, well then I guess you should start ducking all the bullets that come your way.
FYI I have never had anyone try to shoot me because they felt I provoked a situation by going the same direction as they.