I like to check my friends' match history, especially ones at a higher elo/mmr than me, to maybe see how high elo games look like. Then I check this.

Bronze in a high diamond game? And not even performing badly?

I don't know any explanation for this, but this shocked me. Did the Viper smurf so hard and got to Diamond mmr? Did he "somehow" get unluckily placed in Bronze? Or is the matchmaking bad. I'm Silver 2 myself and the highest rank I've seen in my games was Gold 3, and lowest was Iron 3. But a Bronze in a Diamond game and doing better than an immortal gives me so many questions.