Ok let me clarify "a fail catch that goes backwards," I didn't really think anyone would infer anything else from my statement as i believed we were all reasonably intelligent people, who can tell the difference between a failed catch and a knock on.....
arab, you have missed part of the point of here - which is not concerned with knock ons
Scenario : Red kick, and Blue attempt a charge down, but get just a finger to the ball, deflecting the ball just very slightly, but the ball essentially continues on its way
1 did blue touch it? Yes
2 did blue play it? Yes
3 did blue charge it down ?
4 does the 10m Law apply?
for 4 the answer depends on this Law
1[LAWS]0.4.c Was in front of a team-mate who kicked the ball and fails to retire immediately behind an onside team-mate or an imaginary line across the field 10 metres on that player’s side from where the ball is caught or lands, even if it hits a goal post or crossbar first. If this involves more than one player, then the player closest to where the ball lands or is caught is the one penalised.
This is known as the 10-metre law and still applies if the ball touches or is played by an opponent but not when the kick is charged down.[/LAWS]
I think the answers are
3 - Yes that counts as a chargedown
4 - So the 10m Law does not apply
Other posters think
3 - that's not a charge down, that's just a touch
4 - so the 10m Law does apply