I don't think your snarky. Nor is my word the final one. But I argue hard, although it doesn't always serve me well.
I know you argue hard, I do as well and enjoy it. But here is what is weird about that sentence, Alfred said "IT BARGAINED." "With what?" "YOUR LIFE, WARDEN."
So why exactly was Boney bargaining? Was she begging for Harry's life? Or did she want him dead? I mean after all the trouble Mab and Alfred went to, I don't think they'd want Harry dead. \
Oh and one more thing, reading the whole chapter, there was no island before Merlin built it, five times in five different time zones, dimensions, and all at the same time...