To clarify any confusion - I really didn't think very long about it - max 10 seconds - just weighing up how much the raise was, how big the pot was, and whether there was a fold possible or not, and quickly concluding that no, there wasn't a fold to be found for that min raise amount.
It was just the villian's comment, cause I'd said when I flipped my rivered boat up, that I was afraid he had the 9 and his 'how can you call' comment that made me second guess a little. In retrospect though, its just clear that the guy himself had very little understanding of the other points - pot size, equity, other possible hands, and so forth.
And hey its never bad to check yourself occasionally