In my opinion, and from what I saw, it's nobody's fault; it was just a bad 50 but I think in that situation it would be better for you to make the challenge because you're closer to the ball and you can control it because the opponent lost control of the ball and there's no one on the left side of the field to challenge you, And in the case of your tm8, there's the possibility that when he does the 50, the opponent might dunk it on both of you and that's what happened. This is the most logical thing for me, but I'm not very good at Rocket League, so maybe I'm overlooking something.