private IEnumerator <WaitCommand> BeginChallenge(IChallenge challenge, FlightStatistics player)
{
if (_isChallengeStarting)
{
Debug.LogError("Challenge '" + challenge.Name + "' start is triggered while another challenge '" +
_activeChallenge.Value.Name + "' is already starting");
yield break;
}
_isChallengeStarting = true;
Debug.Log("Starting challenge: " + challenge.Name);
yield return(WaitCommand.Interleave(
challenge.Begin(player),
_challengeAnnouncerUi.Introduce(challenge.ChallengeType.PrettyString(), Color.white, challenge.Name)));
_isChallengeStarting = false;
}