It took Cristiano Ronaldo under 13 minutes to score on his Champions League debut for Manchester United, opening the scoring against Swiss Young Boys. With practically his first touch of the match, the Portuguese striker returned home a superb ball from his international teammate Bruno Fernandes to open his account in this season's competition, with the strike 12 years and 132 days after his last United g oal in the Champions League. Ronaldo now has 135 goals in competition, 15 ahead of second-placed Lionel Messi. It had already been an eventful evening for Ronaldo in the Swiss capital of Bern, after a capricious shot during the pre-match warm-up hit an officer guard who was near the stands. Ronaldo quickly jumped over the billboards to see the guard, who was being watched by d 'other stadium staff. Find out more READ: Cristiano Ronaldo scores two goals on return to Manchester United Cristiano Ronaldo monitors a security guard who was hit by a stray bullet. On the pitch, things got a bit tricky for United later in the first half after defender Aar on Wan-Bissaka received a straight red card for an awkward lunge on Christopher Martins.The boys started the second half on the front foot and their extra man advantage quickly started to show as United were forced to defend wave after wave of attacks against yellow and black shirts. The home side got the tying goal their dominance deserved, as Nicolas Ngamaleu pushed home a deflected cross from Silvan Hefti 20 minutes into the second half. match, it took the Young Boys until the final kick to find a winner in front of a noisy home crowd. Young boys celebrate after scoring the winning goal. Jesse Lingard's sloppy back pass in the dying seconds allowed Theoson Jordan Siebatcheu to get behind United 's defense and calmly pass the ball past David de Gea.The crowd inside Wankdor Stadiumfa erupted and the historic victory celebrations will likely continue until late into the night.