article_snippet: On the pitch, David Luiz was in danger of losing control.
article_snippet: Former Chelsea man David Luiz gestures towards Blues striker Diego Costa during Wednesday's encounter .
article_snippet: When Luiz equalised, again Luiz called for calm.
article_snippet: This time the message was aimed at Luiz players.
article_snippet: Luiz celebrated excitedly after scoring against Luiz former club at the Bridge .