Your little story had three different potential outcomes. What we are discussing only had two potential outcomes. It breaks down like this.
Your story (three outcomes):
1) You kill the guy before he can kill you. You infringe on his liberties.
2) You decide not to kill the guy and he kills you. He infringes on your liberties.
3) You decide not to kill the guy and nothing happens. Nobody infringes on anyone's liberties.
What we are discussing (two outcomes):
1) You're allowed to have an abortion due to fearing complications. You infringe on the fetus' liberties.
2) You can't have an abortion even though you fear complications. The fetus is infringing upon your rights.
You don't have that third option with this issue like you do in your little story. There is no outcome here where someone's liberties don't get infringed upon.
Edit: And btw, why would I care if you continue not to respond to the thread. All you guys do is ask me the same questions over and over again anyways.
What liberty did the baby infringe upon in your second example?