In this play, you can clearly see that Nikitin loses an edge while going into the boards and goes into them hard. Now it is unfortunate that this happened, however, the refs decided to point the finger at Zetterberg because he was skating behind him closely and just so happened to lightly nudge his back with his hand before he went down.
In the video it is clear that Zetterberg did absolutely nothing wrong, I mean, it’s Henrik Zetterberg for Christ’s sake.