Ok, let me clarify.
Take an overstable disc and throw it on an anhyzer line or RHBH like this "\". Opposite of a hyzer flip. Just the opposite of an understable disc. Use the stability to flip the disc up flat.
Maybe it's called a flex shot, maybe I'm getting my terms messed up.
Flex shots are great. I throw them often, just not generally on tight lines.
Most people prefer hyzer flips in tight line/tunnel situations. A VERY small # of players will also use a stable disc thrown on a slight anhyzer that finishes straight for tunnel shots. Its a very tricky shot. Paul McBeth and Nate Doss are two guys that prefer the slight anhyzer to the hyzer flip. They are in the extreme minority tho.