Something similar happened to me, only it wasn.t a dink. Sure, channel cats fight well, but world record smallmouth is just shy 12 lbs.
I used to live in a lake community with a large shallow lake, perfect for bass. One day I was fishing a secluded part for largemouth bass using an antique Shakespear bamboo rod and automatic real. Was using modern line, so there was no room for backing. Oh well, no need for backing on a bass rod, right. The rod was a heavy 9 foot bass taper, or if you prefer, about an 8 wt with moderate taper. Cicada were everywhere that year, so for the fly, I was using an antique molded cicada pattern that I found in an old tackle box that I purchased at an auction. One more thing. I was using tapered leader, tapered down to 4X. In hind sight, it was a little light.
I was wading quite a ways from shore and casting under overhanging willows when something came up and sort of sucked the fly down. I set the hook and it was off to the races. At first, I thought it had to be at least a 5 lb bass. I had caught a fee of those before. As time went on, it kept growing in my mind. Muddy lake, and it hadn't showed itself. Because of no backing, I had to start following it. After what seemed like 10 minutes, I was thinking possible state (OH) record largemouth. Then I got a glimpse of it. Making a long story short less long, I eventually landed the fish 100 feet from shore on the side of an old stump. What can I say, I really wanted that fly back. The fish likely was some kind of record, but didn't care and think they kept records for grass carp. But apparently they do. IGFA all tackle fly record is 82 cm (about 32.25") I measured mine against the fly rod. Butt section measures 37 inches and this fish was about 5 inches longer than the butt section. It was so big that I tried to tail it and the tail was too fat to get a grip on it. Anyway, I had no camera with me, and looked around to see if any other anglers were around. No dice, so I simply let it go.