Leeming, 17, scored with virtually his first touch of the ball in the 34-12 defeat at home to Warrington on Sunday.
Anderson told the club’s official website: “That was just a dream. He didn’t have to earn that one, he just ran down the middle of the field and put hand on ball.
“He is over the moon and Kruise was a real positive to come out of today.”
Leeming, who was born in Swaziland and is a product of the Siddal amateur club, signed a three-year full-time contract back in March.