Being a sub in public isn’t slays the best thing when there is a primal dom around and your dom isn’t around. Some doms will respect they see you collared your collared your off limits. Some primal doms are not that way.
Some doms if they have taken an interest in you it doesn’t matter if you’re collared or not. They will make their interest and intent known to you. They will give you a predatorial gaze that is meant to let to know they want you and it doesn’t matter if you are someone else’s they will have you.
Worst mistake you can do this this situation is (1) show your afraid (2) show your sub side. It will not only bring out their hunters instincts but it will make them want to chase you more. You pretty much make yourself a yummy antelope for a really hungry lion to eat.
(This is an umbrella comment for all flavors of doms and subs)
If you are a dom and you try taking another doms sub you are poaching. You will be seen as a predator I the fetish community. You don’t want this hanging over you. Once you know a sub is claimed even if they show interest in you GET PERMISSION FROM THE ORIGINAL DOM!
I can not stress that last point enough. The world is dangerous enough for subs our doms are the only way we can feel safe.