You point your gun at the pregnant woman's head and say, "You'll be coming with me, li'l lady." Her face is one of shock but she has no words. "Just until I find Slim, then you're free to go an' have your baby in peaceful world."
"Well, you found him," comes a voice from behind. You grab Slim's wife and twist the two of you around, putting your gun against her and her between you and the voice. It's Rattlesnake Slim, of course, just as full of venom as ever. "Let her go. I'm gonna see you dead either way, but she ain't got no part o' this." You remain silent while you slowly cock your six-shooter. "Let her go, you damned monster!" he roars.
You're weighing your options, not sure you're committed to the idea of killing a person who's pregant, when the choice is taken from you. The woman you're holding slams her heel down on the middle of your foot, sending you staggering. You clench the trigged reactively, but the shot goes wide as you sumble away. She gives you a sharp push with one hand as she's liberating your gun from you with the other. In the span of a second, you've gone from in control to completely at this woman's mercy. The last thing you ever see is the barrel of your gun as she aims it between your eyes.