What the headline says. Ivan Nova left the game after two innings with forearm tightness. There were a lot of people praising Joe Girardi for his aggressive bullpen strategy - and, in turn, a lot of people criticizing him - but with this new information, it seems that Girardi was forced into doing what he did. He didn't really have much of a choice.
Now, it's important to note that Girardi had Phil Hughes warming up in the top of the second, presumably before he knew that Nova hurt. Maybe Nova didn't hurt yet. So it's not like Girardi wasn't prepared to pull Nova in the early going if he continued to struggle. But he came out after a scoreless second, and now we know it wasn't because Girardi is an avid reader of FanGraphs. It's because his pitcher had an injury.