Was Bottom Pair Good Enough? (tourney)

BLUFF

I don't know what my opponent had, but this move felt like a bluff to me. I thought his bet on the turn with about 25% of his chips meant he had at least 2nd pair, but he could have had a flush draw or bottom pair or even a pair in the hole. Whatever the case may be, this hand turned the match around and gave me enough of a lead to gamble and get lucky on the last hand.