You got there? You got Hermione's owl?
We must have crossed in midair. No sooner had I reached London than it became clear to me that the place I should be was the one I had just left. I arrived just in time to pull Quirrell off you.
It was you [that cried, "Harry! Harry," when I was losing my consciousness].
I feared I might be too late.
You nearly were, I couldn't have kept him off the Stone much longer.
Not the Stone, boy, you - the effort involved nearly killed you. For one terrible moment there, I was afraid it had. As for the Stone, it has been destroyed.
I guess just "one terrible moment there" can make an adverbial phrase as an absolute phrase, then what's the purpose of for?
Why does the main clause use the past tense ("was afraid")?
What's the meaning of the highlighted sentence?