If that is the best diss that Jay-Z could come up with, he's lost about 10 mph off his fastball. Maybe he should really stay retired. That rap was as hard hitting as a feather.
I never heard of Pro'verb before, but his rap was way more clever than the alleged legend Jay-Z (whom I've actually met before and seemed like a good guy. Jay-Z took the time to greet my friend, who is a huge fan). My favorite line was the last one "HOV needs to stay in his lane."
I'm a little disappointed that Jay-Z would jump into this spat and come up with such a lame rap. If you're supposed to be a legend, come with something legendary, not mediocre at best.
BTW, the best diss rap of all time was "Hit Em Up" by Tupac. Of course both rappers in the feud ended up murdered, unfortunately.