Michael pressed his palm, dragged it down the misted glass then his thumb and index finger over his eyebrows, pained at having to have this distressing conversation

He was listening intently looking for ways out that Roth misled him -- and he didn't know they were planing to kill him until something in it for me -- on my own.

Then grief as the full realization of Fredo's betrayal hits him and the subtle nod at the stepped over! tirade and why he did what he did