"The blue scrum half taps the ball correctly and tries a long pass off the ground to her winger, standing on the wing unopposed. The retreating defenders stop retiring, ..."
I have put in bold the stopping of retreat, and in italics the pass.
You seem to have reversed the order, Ian_Cook, of the narrative.
As i read the OP, I have done no such thing
First,
"The blue scrum half taps the ball correctly and tries a long pass off the ground to her winger, standing on the wing unopposed" (the pass hasn't actually been made yet AIUI)
Then,
"The retreating defenders stop retiring,"
Then,
"the pass goes a full yard forward",
"
then off the winger's fingertips forwards and straight into touch."
Are we not agreed that a pass by the half-back taking the actually penalty tap takes place in a rather shorter time than it takes for the retiring players to challenge the half-back in any way?
No we are not. The retiring players were already in a position where they might interfere in play before the tap kick is taken, otherwise, why was there a need to be retiring in the first place?
[LAWS]21.7 (c) Kick taken quickly. If the penalty kick is taken so quickly that opponents have no
opportunity to retire, they will not be penalised for this.
However, they must continue to
retire as described in 21.7(b) above or until a team-mate who was 10 metres from the mark
has run in front of them, before they take part in the game.[/LAWS]
A player does not actually have to play or touch the ball or physically touch an opponent to be taking part in play. The mere presence of a player in a position where he is not entitled to be can have a material effect on the non-infringing side's ability to play the ball how they wish, e.g., by physically limiting the options of the non-infringing side. The infringing side must not be allowed to benefit from their infringing.
In this case, was the "forwardness" of the long pass a result of the tap kicker trying to "thread" a legal pass through opponents who had stopped retiring and were standing in her way. I have seen (in a test match) a player pass forwards directly into an offside opponent at a ruck (Will Genia into Keven Mealamu) and be awarded a PK.
Na Madrai has not told us what his decision was,
No he hasn't,
"What should I give?"
He has asked us what WE think his decision was. That is what we are discussing.
To me a pass which is clearly so far forwards that the receiver can only get fingertips to it is forwards all day long, and if - as others have posted - it thereafter bobbles into touch, it is nowadays an "option" call of scrum or line-out, to me, as described.
Not if the forward throw was first. Assuming no PK for not retiring, the forward pass came before the knock-on into touch, so scrum for the forward throw.
ETA
[LAWS]12.1 (e)
Knock-on or throw forward into touch. When the ball goes into touch from a knock-on or throw forward, the non-offending team will have the option of a lineout at the point the ball
crossed the touch line or a scrum at the place of the knock-on or throw forward, or a quick
throw in.[/LAWS]
Forward-throw into touch = options 12.1 (e)
Knock-forwards into touch = options 12.1 (e)
but
Forward-throw followed by knock-forwards into touch does NOT equal options.