Rather than cat treats, try something really smelly, like a little bit of mackerel or salmon.
Though, I am a dog person, and whilst I like cats, I cannot claim to understand them, so my advice is really just a guess.
Funnily enough there's a cat near me that has it in for my dog. Has had since he was a puppeh. From when i first started walking him outdoors at 12 weeks old, this cat has stalked him lol. It stares at him and as soon as we walk away it follows a few paces behind. Then we turn round and he stops still and stares again until we move off then follows etc etc.
I've known it come running from quite a way off just to stare and stalk.
Totally freaks my lad out