Only the thrower may call marking infractions, except in the case of a double team. For marking infractions excluding double team, if other players notice a marking infraction they may alert the thrower of this, however this call will have no effect. The thrower may subsequently make the call themselves, in which case the opposition should respond accordingly.Any offensive player may make a double team call, however if the call is not made by the thrower, the call should be made loud enough for the thrower and marker to hear. If the thrower echoes a double team call made by a teammate, this should be treated as the same double team call (eg the stall count needs only to be reduced one time.)Any opposing player may make a travel infraction call, however if the call is not made by the marker, the call should be made loud enough for the thrower and marker to hear.