Colette Peignot

[Achebe]

Their prose are a form of opposition. That's what I had in mind.

I get the general idea, but "con" is an opposition to something. They bridge the gap with violent cons = with violent arguments against bridging the gap of yesteryear?
That's the only meaning that can be inferred from the sentence as it stands.

For the pun to work, I think you need to continue after "con" in the next line and talk about what is being argued against.