[Izzy Dunne]

When the woman's boyfriend, 22, got up to defend her, Murphy pulled out a black-handled knife and stabbed her in the left shoulder, police said.

Murphy then turned to her boyfriend and knifed him twice in the back, police said.

So he turned his back to the perp in order to defend her?

[Paulus]

Hard to say because I was not there but I have seen couples get all twisted around in skirmishes before. He (the knifer) lunges. The Boyfriend thinks she will go one way, She thinks he will go the other.