Up front: Do NOT read any answers to this question if you haven't seen the movie, unless you really don't care about spoilers.
At the end of the movie it was not obvious to me what Alex's ultimate fate was. In particular, I wasn't clear whether he lived or died from his injury. It seemed like he might live, as he was still moving a bit, but everyone around him seemed completely unconcerned with getting him medical attention. I even considered the possibility that he was dead at the time of the ending, and we were just seeing him move, but the people in movie were just seeing him as dead.
Is it made clear at some point? Is it purposely ambiguous? Or was I just missing the obvious?