Yeah, the bolded is exactly what I see too. I don't know the exact rules, so I won't comment on whether it should be allowed or not. If they banned any backward or sideways motion on the puck it would seriously limit the forward's options. That's too much IMO.
I don't question the backwards or sideways motion when a player moves it with his stick while making a move as long as the puck stays under his control but I see 3 things wrong with this call:
First is the fact is that he lost control and the puck lay there off his stick and the sideways motion happened while it was out of his control after he made his move. The play should have ended there. Marner was given a second chance at the puck which he shouldn't have gotten. Here the 2 refs missed their 1st chance to make the right call.
As I said too, the second thing is that he entered the blue paint before reaching back to sweep the puck forward while it was outside the zone. Marner had no right to be in the crease before the puck. Why bother painting it blue if it means nothing. This was the 2 refs second chance to blow the play dead as soon as Marner entered the blue paint without the puck on his stick.
3rd Marner impeded Condon's stick which is goalie interference and he did it before he reached back outside the crease and swept at the puck while he was standing in the crease which makes it even worse. The 2 refs had this 3rd chance to make the right call and they messed it up. It shouldn't have even needed a review with 2 refs watching the play.
In truth if they called it properly it never gets to my 2nd or 3rd point.
Now that the Sens have won and there is no damage done for the sake of integrity the NHL should do the right thing and reverse the call stating that they goofed and provide a proper explanation of the rules.
BTW) The Datsyuk move imo is a good goal. It was part of his fake and he was in full control of the puck during the whole play.