In fact he was doing a decent job of distracting her. Maybe she wouldn't look for the injector and figure out what it was, but she wouldn't forget completely. There was no way. She would just have to figure out how to find out what it was some way else. Not to mention that she always enjoyed taunting him.
"Oh what's the matter? Thinking you're not good enough to be my one and only? As a matter of fact, you are. The one that got away. Like a wriggling little fish on a line. To be fair though, you're an awfully big fish." That was putting it mildly. "Wouldn't you just like to know who and what I am?" River shrugged her shoulders a bit. "You have your secrets.. and I have mine. If one day you could actually trust me, I would tell you. But we both know that's never going to happen. I'm looking forward to you trying though, Tempus."