Ah. Apparently the FIA now have a new technical director, now the old one had it so the rules stated when a wheel nut was done up, an automatic sensor would detect that and let everyone know with a green light, the new FIA technical director decided they didn't like that, so the teams now have to go back to the old system from 6 or 7 years ago and when a wheel nut is tightened the mechanic has to press a button to indicate this.
It seems the man in Red Bull forget this and his mind went back to thinking the automatic sensor had gone off, hence the 11 second pit stop as he realised he had to press the button instead.
It seems the man in Red Bull forget this and his mind went back to thinking the automatic sensor had gone off, hence the 11 second pit stop as he realised he had to press the button instead.