Are you sure it was Fairfight? Do you have any screenshots? Were you running any other hacks?
Im not saying youre wrong, nor do i doubt you (especially since its PB and Fragnet detected) but its good to be 100% sure before labeling this as Fairfight detected.
so im using this hack only esp and there's a red text on my screen and it says im being watched
Thats the spectator warning. It doesnt necessarily mean that you're the one being spectated, it just means that theres someone in spectator and to be careful because you can be spotted if you make things too obvious.