/// <summary>
/// Prevents given card from being played.
/// Returns it to user's hand.
/// </summary>
private void CancelPlay(MatchMessageCardCanceled message)
{
CardGrabber grabber = _cardsInHand[message.CardSlotIndex];
grabber.OnDragStarted += StartCardDrag;
grabber.OnCardReturned += ReturnCard;
grabber.OnCardPlayed += PlayCard;
grabber.CancelPlay();
}