According to psychology, verbal abuse in a game results in BOTH sides playing poorly.

As you are informed many times in a match, verbal abuse is heavily frowned upon league of legends, and you have probably seen that if you flame your teammates, will make them perform poorly than before. Generally it is proven that the person directly flamed will have their problem proccesing abilities cut by a whopping 61%, and their creativity by 58%. Also to note, a person belonging to that party or team will also have their proccesing abilities cut by 33%, and their creativity by 39%

What you might have NOT known, is that according to psychology the term goes, "If a person sights another being verbally assaulted, their thought proccesing abilities will be cut by 25%, and their creativity by 45%. Which in terms, if you flame or actually provoke your enemy and your ally bore witness to that action, you are actually bringing a negative effect about the SAME than flaming your ally indirectly. AND will make them more unlikely to cooperate. So yes, if you are clever enough you will notice from the above sentence this includes** mastery flashing**.

(Ever thought that the yasuo on your team constantly flashing emotes everytime he uses E looks stupid? Yeah thats basically this)

There is a reason why showmanship is highly valued in many competitive games and sports. You might have heard on the internet, provoking your enemy will make them agitated and make them less focused. BUT you must know that typically those terms come from** 1V1 PVP** and League of Legends is a team game which many parties are involved. Flaming and exssesive BM basically brings the game of both sides in poor quality and that is why it penalised.