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If moving on ground (not falling, jumping, or flying), any still water blocks with air above within a radius of 2 + level around the block being moved to will be turned into frosted ice. The water blocks must also be on the same level as the block being moved to in order to become ice.
Continuous motion is required for ice to remain when light levels would otherwise cause it to melt. When a player stops walking on the ice created by the enchantment, the ice gradually melts from around and under the player (at which point the player falls into the water). In addition, the ice created from Frost Walker lasts longer during the night, as it will not be melted.