If an FT team spots you, most of the time they are relying on the Spotting function, myself included most of the times because I can’t see that well, and there are many leaves and tree branches, so you get a little green icon on top of you and a red highlight around your body to better know where you are. You can’t really hinder our progress unless attacking the FT team when they are holding the button on some kind of function. You can, however, trigger the camp alarms by being spoted by the AI so there are more of them when they go there, to give them a bit more a distraction, while you hit them from afar or jump in close and slice them. And sure, you can lull them into a spot and try to take them out one by one, but most of them gonna hunt you relentless, following your green blood trails and listen close to your footsteps and if you are healing nearby.