It didn't look that bad to me. Reaves didn't jump into him, raise his stick, or even his hands, and I don't even see how you can consider it a blind side hit. Also was in open ice, and nowhere near the boards. Reaves is a heavy, heavy hitter, but is usually oddly clean when he hits.
Years ago it would've been a no call, though sometimes, even back then, a clean hit would be called just because it was so hard, or the outcome so dire. I mean, how can Nurse not see him in that situation? Reaves is the size of a small truck, and he has to know he is in the area. Nurse is also a very large man, taller than Reaves, but he leaned down into the hit, making it worse.