What a difference a word makes!

John 13:27 says,

27 Now after the piece of bread, Satan entered him. Then Jesus said to him, "What you do, do quickly." (NKJV)

Here's how the New American Standard Bible reads:

27 After the morsel, Satan then entered into him. Therefore Jesus said to him, "What you do, do quickly."

This changes the meaning of the interaction between Jesus and Satan.

As a result of Satan entering Judas, the text says, THEREFORE Jesus said to him..."What you do, do quickly."

Jesus is talking to Satan, NOT to Judas exclusively!

Certainly this sheds some light on the next verse:

 "Now no one of those reclining at the table knew for what purpose He had said this to him."

Jesus was talking to Satan, not to Judas.