The Chiefs turned the ball over on their own 30 so even in the unlikely scenario that they manage to keep the Lions from gaining any yards at all it's at best a 45 yard FG for the Lions. Also Why would the Chiefs get the ball back on their own 10-20 yard line if they punt, their punter had been killing it all game and if they 3 and out the Lions they're not likely to flip the field like they hadn't been all game. I have no idea why the idea of going for it on 4th and 25 and making it very likely you're down by 4 with no time outs and under 2 minutes left when you haven't scored a touchdown the entire 2nd half makes more sense than punting it and making a stop which your defense had been doing most of the day.