So let me get this right.
-The Nordsjaelland player tries to get the Shakhtar player sent off by pretending he has been hit in the face.
-None of the officials see him trying it but the ref stops play shortly after because he sees someone down holding their head.
-Play is then restarted with a drop ball as would be normal for a stoppage for such an injury.
-The Shakhtar player scores.
And everyone, including UEFA and the Shakhtar manager, jump on the guy who scored for not honouring the "sportsmanship of giving the ball back to the other team" and totally ignore the fact that play was stopped because the Nordsjaelland player feigned being hit in attempt to get another player sent off.
Sounds more like a perfect example of karma taking action against the cheating Nordsjaelland player to me.