A reverse camber ski still flexes and rebounds. I just call it decambering/re-cambering/rebounding so people can picture it. A reverse ski still does all of those things, it's just that its final resting shape when all of the flexing cycles have finished is reverse cambered. If you push into a reverse ski, then quickly release it, it will rebound back past its resting shape, just as a traditionally cambered ski will rebound back past its resting shape.
The no-release release doesn't really happen with pivots because pivots arc upward on a free hinge (ie. they don't slide backward along the ski) for forward pressure {or more accurately to keep the distance between the binding toe and heel constant about a fixed length boot sole) when the ski is flexed. Pivots don't rely on spring pressure for forward pressure. Because a pivot heel piece is on a free floating, very low friction hinge that doesn't have a recoil associated with a change in direction (as a spring does), the binding heel piece can freely move and change direction with the boot regardless of what the ski is doing. This is why pivots are relatively insensitive to forward pressure setting.
Think of pivots in the same way you think if a tele binding.
The distance between the toe and heel stays the same because the binding heel can arc upward with the boot sole heel as the ski flexes deeply.
With Salomon's (and any other binding on a track that uses a forward pressure spring), for the distance between the toe and heel piece to stay the same (in order to accomodate the fixed length of the boot sole) when the ski is flexed deeply, the binding heel must slide backward along the track fixed to the ski surface and push into the forward pressure spring. When the ski flexes back, if the spring can't keep up, there is a moment where the binding heel is still backward on the track, but the rest of the system has rebounded, and now there's nothing holding your boot heel in the binding. This is why bindings with a heel track are relatively more sensitive to forward pressure setting.
That's pretty much exactly what the BAM Pindung is; it's a look pivot heel with a Salomon Shift toe (although obviously accomplishing the same thing as the Shift toe but in a slightly different way, and with what looks like a lot more metal rather than carbonthermoplastic). Sure. Look should probably buy BAM, or at least the Pindung, drop the weight and giver. The Pindung is basically the RedShift I've been wanting Salomon to release...but with a pivot heel which is even better IMHO.
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