You heard the exchange correctly.
Biden couldn't shut up... he could see that Kyl was going to ram his own blather about Bader-Ginsberg right down his throat, so he purposely interrupted to "lighten" the moment.
Kyl is absolutely doing a fabulous job as "clean up hitter."
We've been talking about how democrats interrupt whenever a republican is about to make a good point, to throw them off.
This morning a guy at work said the REPUBLICANS always interrupt because they can't stand hearing the truth.
I asked him for an example, giving him several examples from the hearing yesterday and the now-famous Bob Novak blowup on CNN.