This time last week, Riot decided to suspend progamer Hosan from the EU Regional Finals after they found that his LoL account had received a permanent ban from their Tribunal system.
The Tribunal is a measure put in place by Riot to let the community manage itself. If a player thinks another player is behaving badly, cheating, using inappropriate language, and so on, they can file a report. Along with the report they must also attach evidence. This could be chat logs, videos, screen grabs, anything that supports their claims. The players on the Tribunal assess the reports and, if action is to be taken, they determine what the punishment will be.
So, in the case of Hosan, the evidence presented to the Tribunal warranted a permanent ban of his main account. We don't know what it was so far, but if it were something like cheating then that would likely have got out by now.
Riot chose to enact further punishment by applying a one tournament suspension to Hosan, saying: "Upon further review from our eSports team, we confirmed the assessment by the Tribunal and have decided that Hosan will receive a one-tournament suspension as his online conduct is behavior that would be penalized at any and all official Riot Tournaments."
This forced Elohell to compete without Hosan, bringing on Vander as a substitute. We now know how that turned out. So there may be some unkind words being said around the Elohell shower rooms tonight (they have shower rooms right?). I mean, they just lost their shot at $150,000.