Welcome Tenn...this is among the most discussed aspesct of GFII because the prevailing consensus is that the actor who said "Michael Corleone says hello" improvised the line at the time, which, as it turns out proved temporarily fortuitous for Roth. But if you pick the scene apart, the pnly reason Pentangeli was not killed was because the cop happened into the bar which caused everyone to flee prematurely. Strangely, however it seems the Rosatos got away while Frankie and Cicci were caught and brought in.