IMO, the Law does not recognise a "swing-and-a-miss" as a punch. The strike has to land
[LAWS]10.4 DANGEROUS PLAY AND MISCONDUCT
(a) Punching or striking. A player must not strike an opponent with the fist or arm, including
the elbow, shoulder, head or knee(s).
Sanction: Penalty kick[/LAWS]
So no RC, however, I think it ought to be, and it would be relatively easy for the iRB to fix this.
10.4 DANGEROUS PLAY AND MISCONDUCT
(a) Punching or striking. A player must not strike
, or attempt to strike, an opponent with the fist or arm, including
the elbow, shoulder, head or knee(s).
Sanction: Penalty kick