I've Solved the case of bronze.
In my recent games ive seen something , bronze is like quicksand , but thats beside the point. Simply put in my own beliefs the team that is less emotional and taking everything personal wins. Im not sure if this is normal in silver , gold , ect. but in bronze if ur team is chill and ok with one or two mess-ups and the other team is freaking out over a bad engage or taking a red late game ur almost...
teed a win. ;)