This is only based on the INTJ's I know...
I'm going to agree with the above suggestion of being genuine. If you ever try giving an INTJ the illusion that they're pursuing you, even though you're actually pursuing them, you'd better be damn sure you can pull it off. If they sense you're trying to outsmart them in some little love game, they're going to rip you up one side and down the other, and it won't be pretty. Or, if they choose to be nice, they'll probably just ignore you from that point on.
I'd suggest that you take advantage of any situations that might lead to a short, intense conversation involving something intellectual, or quick-witted, humorous or sarcastic banter.
Then, whatever you do, back off. Even if you feel like you'll explode if you don't see that INTJ again soon, back the hell off. Go away. Hide yourself under a rock. Give them a chance to breathe, and then casually show up again. If they like you, they'll be happy to see you. Only, you probably won't notice because their greeting will probably be an insult.