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From Tekkenpedia

Bound is a "new" feature that was introduced in Tekken 6. While the distinct properties of the Bound system is new, it was based on an already existing system of juggle enders. Some juggle enders would literally "slam" the opponent into the ground, which meant that they could not tech roll. The Bound system builds on that by making the lower body of the opponent "recoil" when they slam into the ground, partially lifting it into the air, giving the player the chance to continue their juggle. Additionally, in stages with breakable floors (Cemetery and Fallen Colony), if the floor is broken at any time, the fighter that was knocked through the floor will have their body react in the same way.

In some reported cases, it has been said that an opponent has been bounded more that once, though they have yet to be verified, and the circumstanced are not yet investigated.