Indy/SD

[Barcelona]

What I haven´t seen here is this:
Referee announced that ruling on the field was interception and then IW. However, that whistle wasn´t inadventent, it happened because of bad judgement and it was an incomplete pass call.
Yeah, those guys made it clever and they "internally ruled it over" to IW, but wasn´t it so, that the call was incomplete pass and to change in, there should be a challenge (if that play is challengeable)?
Because next time, on officials make a mistake for example on sideline catch and rules oob catch, there could be also an "IW" on a catch.