If you break any of the rules mentioned here you will be subjected to the penalties also mentioned. In the specific instance, Fnatic and Roccat both lost a ban for calling unauthorized pauses, and Fnatic lost a second ban for talking during a pause.
Fnatic Tweet
Roccat Tweet
Unauthorized Pause rule:
If a player pauses or unpauses a game without
permission from an LCS official, it will be considered unfair play and
penalties will be applied at the discretion of LCS officials.
Talking during pause rule:
For the fairness of all competing teams, players are not allowed to
speak to each other during a game pause. For the avoidance of doubt,
players may communicate to the referee, but only when directed in
order to identify and remedy the cause for the stoppage. If a pause
extends long enough, referees may, at their sole discretion, allow
teams to talk before the game is unpaused, in order to discuss the
game conditions.
All of the rules are too long to list here, but the possible punishments are:
- Verbal Warning(s)
- Loss of Side Selection for Current or Future Game(s)
- Loss of Ban for Current or Future Game(s)
- Fine(s) and/or Prize Forfeiture(s)
- Game Forfeiture(s)
- Match Forfeiture(s)
- Suspension(s)
- Disqualification(s)