I just watched it, Rashford is just about to swing at it and he gets a shout from Fernandes to leave it I think. If that's ok in the rules then fair fucks, but it's one of those that seems very counter intuitive. How long will it be before teams actually start using players in deliberate offside positions to cause mayhem.
Edit
I mean actually having routines where offside players distract and feign to go for a ball and dummy it for someone else.
I still think there's scope in the written rule to disallow... Or at least not over-rule as a "C&O".
Bang on about it being tactically abused though. Inevitable.