Die harder than bruce willis is a dope punchline...you have to look at it historically, of course now this sounds kind of weak, but back then, this was an original, pertainent line.  You know Die Hard had just come out, and in the context of a rap, that's called a "punch line":  when you sum up a lot of references or jokes into one line, that's a style of rapping.  There is story-tellin, freestylin, and bullshit as well as other things like "whisper", snap, or trap.  Obviously ice-t isn't on Rakim's level, but in context, this is lyrical genius.  don't get it confused