I see, the statement you used was confusing, which got worse with the clarifying quote. You said "took a trap as a challenge", which (1) refers to a different trap, using article "a" and not "the", which I wrote off as a typo in the first comment, and so also discounted the possibility that your comment (2) only states that he took it as a challenge, not that he faced that challenge, which is not the case for the trap I was talking about, and (3) the statement still isn't strictly speaking true, Dumbledore is saying that he expects this to be likely, not that it happened. I agree that Dumbledore's saying that makes the conjunction more likely.