Water Roll Jump
A water roll jump is a type of roll jump performed in shallow water to avoid triggering Jak’s high-knee walking animation, which significantly slows movement.
Technical
When landing in shallow water, there is a small frame window when Jak is on the ground but not yet in his high-knee walking animation (which is reserved for walking in shallow water). Usually, roll jumps cannot be performed in shallow water, but if the roll jump inputs are inputted before the high-knee walking animation begins, a roll jump will occur.
Discovery
It is unknown who first performed a water roll jump since the technique can easily occur during casual play.