If Ken had said all of that in a different order, the part about Ken trying to kill him might have seemed a little more surprising..

But if that person was working with some enemies, then it's a little less surprising. Especially since Madoka knows that Ken - despite him being even younger than her - sure can be more brutal than her. He's used to fighting. He's.. probably used to doing things like that, even though it's kind of a sad thought.

No, that's not the surprising part. The part that's making Madoka think really hard seems to be: "You tried to kill him.. But he still saved you..?"

It's not something just anyone out there would do, she thinks.