The knife was infected - looked pretty clear to me. And Rick could've slashed Negan's throat much worse... why didn't he? He want's Negan and the Saviors to know that Negan is doomed. That's all part of it. Do you think the Saviors will continue to follow Negan's orders now that they know he's finished? Rick's speech was not only meant to distract Negan, but I think he was using it as an opportunity to speak to any Saviors/Hilltop/Kingdom members within earshot (which is pretty much the entire comic cast) and show that he is the one that should be leading things. Rick doesn't necessarily want all the Saviors to die. He wants as many defectors as possible to help him rebuild once the war is over.
This was a great issue. The infected knife was just icing on the cake. Truly brilliant and surprising. Also agree with JM - quite poetic. Negan will suffer the fate that he wished upon Rick, and dealt to Nicholas.
This post is the first one to articulate my feelings on what's going on with this issue and what Kirkman is doing. Rick didn't just turn "evil". Rick just spoke out loud to all the Saviors letting them hear his perspective on rebuilding vs. Negan's ways of rebuilding. Rick knows there are plenty of Saviors that have a personal beef with Negan and also knows that multiple Saviors were involved in helping Eugene and crew escape.
Rick smells mutiny in the air if he can just convince them to not fear and see that there can be something better on the other side. This brings us full circle on the whole "Something to Fear" arc that introduced us to Negan and the Saviors. So, yeah... My opinion is that Rick isn't talking to Negan or trying to reason with him. Rick is distracting and disorienting Negan, but he's really talking to the Saviors and explaining his vision.
I have a feeling rick just sacrificed himself to kill negan. Like the all say no one can get close enough to do it without getting killed. These panels with Andrea and Carl kinda got me on edge.
I believe Rick knows anything could happen when he steps outside to face Negan. That's why the hug with Andrea and Carl is emotional and why he peps them up with the "we don't die!" line. I believe Rick would be willing to sacrifice himself, but I don't think he's going out there to die.
If Kirkman really wants to shake things up, then yes...126 should be a bloodbath with both Rick and Negan dead at the end of it. Then we find the regular folk from the Saviors' camp wander in for 127 wondering why no one came back and hooking up with whoever is left to carry on Rick's vision. This is the spot for the Euge to take over as leader.
But, I expect that Rick will live and carry on the work himself and that most of the Saviors will be happy to join in the effort to rebuild and grow trade between the communities. I don't expect to see Negan getting his head bashed in page after page in a retaliatory spirit if Rick is truly trying to demonstrate that he can lead and rebuild civilization.