That was awesome! On board with the Schu round Spa in mixed conditions. What a great track. I think the video also clearly shows this:
1. Rosberg falls completely off the road and Michael goes by giving him plenty of space, but Niko cuts back across the track and hits him.
2. Near the end the two are running side by side and Niko effectively punts Michael off the road, leaving not a foot of space for Michael's car.
In both cases, remarkably hard driving against one's team mate I would think.
As said above, tit-for-that. Whether Nico perceived that Michael gave him plenty of space in the first incident is questionable, usually drivers are egoists and find fault with the other one first of all. Despite that, none of the two complained about the other, so good marks for that!