The way he was holding his leg, I thought from the get go he probably caught a knee to the inside of his knee, but I was still holding my breath for an awful long time. He didn't even limp when walking off the court, so I started breathing again after that.
And when they showed the replay, I was expecting his knee to bend completely the wrong way and just see his ACL pop out of his skin... SO, I watched the replay like this: