Why Did the Pharisees Try to Save Yeshua’s Life? A Question on Luke 13:31

“But the Pharisees went out and conspired against Him, as to how they might destroy Him,” Matthew,” 12:14

At that time some Pharisees came to Jesus and said to him, “Leave this place and go somewhere else. Herod wants to kill you,” Luke 13:31

 I was wondering about Luke 13:31 this morning…  Why did the Pharisees, a group that previously had sought to destroy Yeshua (Matt. 12:14), try to save His life by warning Him that Herod was trying to kill Him?

Is it possible then that some Pharisees in Luke 13 were actually trying to save His life?  We know that some of them, after witnessing the signs He performed, were drawn to Him and acknowledged Him as a great teacher (John 3).

Does anyone have any thoughts on this?

P.S.

Here’s another passage indicating that there were divisions within the Pharisees regarding Yeshua:

“So the Pharisees again asked him how he had received his sight. And he said to them, “He put mud on my eyes, and I washed, and I see.” 16 Some of the Pharisees said, “This man is not from God, for he does not keep the Sabbath.” But others said, “How can a man who is a sinner do such signs?” And there was a division among them,” John 9:15-16 

Source: Orthodox Messianic Judaism (http://goo.gl/tTgTQM)