Ryan was never one to panic. Even if the situation had gotten to a stage he couldn't handle. So what he just did, in order not to give out the clue he had, was to observe the movement of the two cars behind his as he continued driving home. At least he still got like six minutes left before he finally gets to his destination.
Whoever was on his tail must truly be an expert, he thought. Because the smoothness of the way he had been followed without him taking notice since leaving the office showed the tailer's capability. If his hyper senses hadn't reacted to that much later, he was sure the job would have been clean and he might have just been another victim of who knows what.
Since he wasn't aware of what the tailer was after, the motive and sorts, he decided to play a little game with whoever it was. At least to show him that he was messing with no ordinary man. And yeah, it was going to be fun.