Referee admits VAR error in Chelsea vs Spurs match to protect colleague

Former Premier League referee Dean says he failed to correct mistake by referee Taylor in Chelsea vs Spurs match.
Dean was VAR official when Romero pulled Cucurella's hair before Spurs goal, but did not ask Taylor to review.
Both managers Tuchel and Conte booked after Taylor did not penalize challenge on Havertz.
Dean acknowledges he made "really bad call" in order to avoid putting pressure on friend Taylor.
The decision impacted Dean, as he was taken off VAR duty for two months before retiring.