[quote=@Webmaster]
<Snipped quote by ZAVAZggg>

It doesn't interfere—some beings are very knowledgeable about the interworkings of Existence and some are satisfied with what knowledge (or lack thereof) they have. I'd imagine with that age, they'd know about the Tier System, but whether they'd know about TL specifically just depends. He himself does not travel time as a sort of joyride; rather, he cleans up the messes of other time travelers and ensures that nothing wrecks the present.
[/quote]

I see. In that case Fenris might have heard rumors about his existence or may have knowledge on him due to nigh omniscience, but never met him personally. Like I said, it makes avatars to go into different times to experience new things and part of that would mean making an avatar that perfectly blends in with the verse and time period at hand. Also, I bet TL has had a lot of problems with the Doctor.