The news report on this site describes how Luiz Adriano scored an unsportsmanlike goal...
Adriano...rounded the Danish club's keeper to score after an uncontested drop-ball
...and will reportedly face disciplinary charges. I am not familiar with the finer points of the written and unwritten rules and etiquette that apply in the situation, Article 5, UEFA Disciplinary Regulations.
What was the situation that lead to this goal and what did he do wrong? What is a player supposed to do instead in this situation? Did he violate an explicit law or a gentlemanly convention?