I agree with FH--it was a "how dare you" look. Also, it's my theory that, though Michael left Roth in Miami with the impression that he was going to kill Pentangeli, Michael instead dispatched Pentangeli to patch up his differences with the Rosatos. Roth must have been very worried that Michael no longer suspected Pentangeli in the Tahoe shooting--and might have been suspecting Roth. So Roth had Pentangeli killed to get rid of a Michael-ally and to keep Frankie from cooking up more mischief with Michael. Roth disguised his real motive for killing Pentangeli in that world-beating speech about Moe Green. It was his way of telling Michael that the killing of Pentangeli was a quid pro quo for Michael's killing of Moe Green. And, plawrence, I agree: that was Strasberg's Oscar right then and there.


Ntra la porta tua lu sangu � sparsu,
E nun me mporta si ce muoru accisu...
E s'iddu muoru e vaju mparadisu
Si nun ce truovo a ttia, mancu ce trasu.