[NM FP Ump]

I don't call ISF, but in USSSA and FED, in both of your situations I have "Dead Ball, Batter is out". If the bunt hits the batter in fair territory (outside of the boundaries of the batter's box), this is dead ball, runners return to the last base touched. If the bunt hits the batter in the batter's box, this is again dead ball, and because the bunt attempt with two strikes wasn't a "fair ball", the batter is out. In both situations the batter is out, but for different reasons.