re: When Vito Corleone came to America

I never got the part where Danny Aiello chokes out Frank Pentangeli and he says, Michael Corleone says hello."

Was Michael really saying hello, or was that a setup?

And how about that cop? He just starts shooting. Has no idea what's going on, just pulls his revolver because someone starts yelling in the background. Next thing you know, Cicci is taking five shots and two cars in the chest. No dogs around, either.