If Jodi didn't have a knife or gun with her and had to go fetch them, then why couldn't she have kept running and gone right out of the house? Travis was naked and wet. We know this much. Jodi was dressed. We know this much. Pictures provide proof of that.
So if Jodi was in fear for her life and had enough time to go retrieve a knife and gun and come back into the bathroom, what prevented her from leaving altogether? What 'forced' her to go back into the bathroom and stab T.A. 27 times, 9 times in his back, in the back of his head, slit his throat ear to ear and shoot him? At what possible point in that 2+ minute attack was she incapable of .... leaving. T.A. was mortally wounded from the first stab wound to his heart. That is from testimony by the M.E. The neck wound itself was fatal within mere seconds. A shot to the head according to the M.E. would have incapacitated T.A.
She very well could have left if her life was in danger. She had the advantage of being dressed, and having weapons.