If you can imagine stuff then so can I. I imagine that Cruz was telling Clinton, “do not support me Bill!”
Actually, the fonecon was between Trump and Bill Clinton.
Now that I think of it, the fact that they spoke being in the public record, is itself interesting. If Person A calls Person B, that fact doesn't get into the public awareness unless one of them tells someone else who goes to the press with it.
Or calls the press himself.
So why would either Clinton or Trump want all of us to know that they had a heart-to-heart, before Trump announced?
I wish I knew.