I have recently come into a shocking discovery, I checked Jamie Hector's (knox) and Blake Shileds' (flint) IMBD page and they only have filmed up to Episode 9 'It's coming', This makes me think That when they have their altercation with Claire, Somehow they die. I don't know how and Who by and I might be entirely wrong but it is a possibility.

This would be a shame because just when you think you are getting used to these characters they get killed off, Personall I hope it doesn't happen but what about you?

Because Meredith's brother is flint...and Meredith's daughter is Clair, Then that would make Flint her Uncle...Wouldnt it??
So maybe he finds out before he actually harms her.

if he does find out Claire is his niece then maybe he'll not want to hurt her and Knox won't be happy and punch throw him like he always does.

or maybe they've been captured and back to level 5...

Thats perfectly possible also

or maybe IMDB is very meticulous in updating their database..?

IMDB posts mostly infos after they got them and they might not know yet if these two will be in more episodes or not so....

Even I don't believe that Flint won't have any reunion with Meredith anymore, it might be the case that Sylar is killing them both or at least Knox cause from some pictures we saw it looks as if Claire with Knox and Flint are in Canfields house and sylar comes there as well but since these are only pictures they might be from different parts of the episode or two different episodes so I can't really tell.

It is not just IMBD. If you look at the NBC descriptions it usually says "Jamie Hector and Blake Shields guest star", but it doesn't say that for the next two episode and I doubt they would be left out of two in a row, One episode yes but not two.

Edit: So I Double checked it they are in the next 3 episodes so far, Sorry about this confusion folks.

Anyway I'm glad, they might quite a good villainous duo.

there are fast becoming a double act... like ant and dec but with more atitude!

i take it Flint is Ant with the big forehead

hahaha power punch
yeah thats what i thought but not the
power punch part i dont think flint would
be scaed of knox ;p

Well if these 2 die then hopefully HOPEFULLY this will mean some sort of confrontation between the good side and the bad side

i dont think they r death yet.... i checked the rest of the cast on IMDB, and they all just filmed The Eclipse, Part 2 (2008) The Eclipse, Part 1 so maybe this two characters(knox and flint) dont appear on this two episodes... and hasnt started filming the next episodes.. i dont know... thats an idea hehe !