Maybe it's United's idea to test him like this in order to potentially give him a back office role at the end of the season - I heard that they are interested in that. I don't understand what will they be getting with him as an interim coach though - maybe the players will have to impress him if he will be in charge of assembling the team for next season.
Rangnick and Woodward together in director/consultant role? This will be really fun to watch.
Man United does have few options in choosing a new coach, but that doesn't mean they have to rush to sign a coach. Well, even though Ralf Rangnick is only an interim coach, but he hasn't coached any club in 2 years, while the problem that Man United is currently facing is quite complicated. If only as an interim coach, Carrick should be given the opportunity to live it because he has been with Man United for a long time and he has made a good start against Villarreal in the Champions League.