Draw a card

You draw a new card, hoping to stay under 20. It's a +2, making your 15 a 17. Barriss also draws a card, she gets a +5, now both of you are at 17.

Getting closer to the 20 threshold, you should think twice on your next move. Each time you draw a new card you, the probability of losing increases. But should you still remain under 21, you would be practically wining the game, leaving Barriss with very few ways to beat you. She notices your hesitation and tries to draw your attention with all sorts of taunts.

Barriss: Why so quiet now? Not what you expected?

Lana: Can't you just shut it? I'm trying to concentrate!

Barriss: Oh, you may concentrate as much as you wish, it'll soon take all you concentration to be able to walk straight and upright with your lightsaber in your ass!

Lana: You just shouldn't be so sure about that happening! I think your vagina is itching to be treated that way!

Barriss: I would just play your +1 if I were you, after all, you aren't cocky enough to go for the 21 itself!

Lana: We'll see how cocky you are, when you lose this stupid bet of yours!

Barriss: I'm waiting girl, what will it be? A +1 or a draw?

Lana (thinking): If I play my +1, I'll have 18 and she'll have 17. That means she must draw a card, if she goes over 21 I win instantly! But if she has a +2 or +3, I'm damned straight away! But if I draw a new card and it's higher than +4 I'm damned again! What should I do...?