Method onFallenUpon

src/main/java/net/minecraft/block/Block.java:1130–1133

Block's chance to react to a living entity falling on it. @param fallDistance The distance the entity has fallen before landing

(World worldIn, BlockPos pos, Entity entityIn, float fallDistance)

     * @param fallDistance The distance the entity has fallen before landing
     */
    public void onFallenUpon(World worldIn, BlockPos pos, Entity entityIn, float fallDistance)
    {
        entityIn.fall(fallDistance, 1.0F);
    }

    /**
     * Called when an Entity lands on this Block. This method *must* update motionY because the entity will not do that