It says on another site that it was from a bad Neymar pass during rondo.
Looks like Neymar sulks a bit and tries to come out Rondo and Suarez puts the youngling in his place.
In a way the video shows their good relationship as Suarez feels comfortable to have that influence over Neymar and Neymar doesnt react.
You wouldnt see that incident pass off like that between two players that had any issues.
Yeah, in that context it suddenly makes complete sense. It's funny, because if there was any bad blood between them, Neymar would have barked back at him there.
By the way, Luis also pushes Gerard similarly at 3:36 into this video from the same training session. I guess AS haven't noticed that one yet.
If you watch the whole thing, the group is in a fantastic mood, including Neymar, who looks to be having a regular Neyday