Heads up agreement?

[dizzle98]

The problem is these players are NOT heads up though. They are still involved in a 4 way pot. They are the only two who can still have action but that does not make it a heads up pot. And they clearly cannot just agree to check it down any more than they can agree to just split the pot or run it twice.

And yes they're colluding, and yes they still want to get to showdown. They are not colluding in the typically thought of way of driving another player out to keep the pot to themselves. They are colluding to both get to showdown for free from that point on. They clearly both have SOME kind of hand at this point, assuming they were not working together before this but instead ended up all-in on some kind of actual hand. Keeping one hand concealed is not an issue since they both have a real hand and were presumably not raising-reraising simply to drive other players out.