What is a casting punch and what does Fedor and Igor throw?

[AlexKid]

So whats a casting punch ( a russian way of punching)

What is a whip strike (I think its the asian version of a casting punch that the russians took and modified into a casting punch)

How does the way Fedor Emelianneko and Igor Vochanchin throw their hooks/ punches differ from teh above tow how do they throw a punch and if it has a name what is it called?

Also tell me what part of the fist these punches land with is it the normal place hooks land or does it land more like a back fist?