There was a scenario over the weekend that gave rise to a similar question. NO in the middle, Northampton attacking fairly close to the Racing Metro line, George North (who I think is the competition's leading scorer) about to receive the overlap pass that would give him his second try, having scored an identical one at 48 minutes. Lapeyre takes one for the team and deliberately knocks on to prevent GN from receiving the overlap pass just a few yards out.
AR calls it in to NO, who goes over to have a chat, confirms that they don't need to go upstairs, issues the YC, and then awards the PK with no consideration whatsoever of the PT. A true :holysheep: :wtf: moment for me, but the commentators equally didn't think it worthy of mention so there was no replay showing the wider view.