I think Kakashi is preparing to summon his petz dog. Just like the Zabuza fight, it looks like Kakashi was done for when he got hit with the sword. Now that we see blood pouring out of his head, its dog pound time. And if that doesn't work, MS sharingan time.

Also, Pein doesn't seem too godly now, he's rushing to get rid of Kakashi after seeing what he's capable of. From now on, Pein = Magneto faggot.