Steph did seem to turn his ankle.. but that highlights everything I've said.. when your main game is being a shooter, and your team is better than everyone else.. you have the luxury to play like it's a YMCA night league.. You're up 25, everyone's laughing, and you don't have to grind..
When Curry finally plays a great team that's healthy, he has to work for it. And when that happens, you push your body to the limit and injuries happen. Wear and tear sets in.
If Curry doesn't have the overwhelmingly better team, he becomes very pedestrian. Not clutch, doesn't like to really mix it up, and he wears down. When the odds were stacked against him in the last 5 minutes, he absolutely folded.