Some exerts taken from the Rugby League laws Book:
SECTION 10
KNOCK-ON AND FORWARD PASS
Accidental 2. If, after knocking-on accidentally, the player
knocking-on regains or kicks the ball before it
touches the ground, a goal post, cross bar or an
opponent, then play shall be allowed to proceed.
Otherwise play shall stop and a scrum shall be
formed except after the fifth play-the-ball.
After a player, from the field of play, knocks on into his
opponent’s in-goal area and he or a colleague touches down,
play is restarted with a scrum where the knock-on occurred,
except after a play-the-ball subject to Section 12, Law 10.
SECTION 6
SCORING – TRIES AND GOALS
Try – How scored 3. A try is scored when:–
(a) a player first grounds the ball in his opponents’
in-goal, provided that he is not in touch or touch
in-goal or on or over the dead ball line.
(b) opposing players simultaneously ground the ball
in the in-goal area provided that the attacking
player is not in touch or touch in-goal or on or
over the dead ball line.
When an attacking player fails to ground the ball correctly,
play continues unless an illegal event has occured , e.g. a
knock-on or the ball goes dead.
SECTION 11
THE TACKLE AND PLAY-THE-BALL
(e) When the ball touches the ground it must be
heeled (i.e. backwards) by the tackled player. The
ball must not be kicked or heeled by the player
marking him.
The ball is in play when it has been played
backward.
You Guys decide!?