If a player you selected starts/plays for any length of time, all bets stand on that player. This means that, if you have selected a player who gets injured before getting over the amount of stats you needed, unfortunately your bet will be settled as a loss. In this same example though, if you backed that player for 'unders' your selection will be a winner.
Remember, when one leg loses in a same game parlay, the whole parlay is a loss.