Calling timeouts
One person on the Offense - either a coach or a designated sideline person (presented to Observer ahead of game start) may call a timeout WHILE a player on the Offense is holding the disc (can be in their throwing motion).
The coach or designated sideline person for the team preparing to take possession after a turnover may also call a timeout after the turnover has occurred AND after the disc has stopped or becomes out of bounds AND before their player picks up the disc.
Person calling timeout must get the attention of an Observer to call the timeout (use of flag is possible).