At this point Peter rebuked Him.
I think he only heard the first part of the statement and it so busted the scenario he had envisioned that nothing else registered. He didn't really listen and think . . . the Lord was going to personally RISE FROM THE DEAD!
Unfortunately, this malady is quite common. I too, so very often, read the Word, see the statements, hear the message from the Lord, but don't stop to listen and think about what HE IS REALLY SAYING!