[Nick C]

The flop lead isn't obligatory, but aside from that, it's hard to see an easy way out of this mess.

Unimproved on the turn, it looks like a time for caution, and meanwhile I think you could just check-fold some random diamond. But as it is, you hit a card that's quite likely either terrific for you or about the worst thing you could have caught.

And, damn, on the river I might tell myself that CO probably has been slowplaying a set or his AT (possibly specifically AdTd) just hit, but the decision doesn't seem easy to me.

My guess is that a fold is best. You will get to see the hands, for what that's worth, but I'd imagine that sometimes the information will be tilt-inducing (it would be for me).