Well this was something and a half.
Diego Costa had a very Diego Costa game. He scored a couple goals, he dove a couple times to great effect and he got fouled a couple times.
But his second goal may have been the best thing of all. An argument could have been made to disallow the goal because Costa did hit a Swansea defender in the face on his follow through.
The goal helped put a band aid on some of the bleeding by Chelsea in the second half. Leading 1-0 at half, Chelsea allowed two goals in two minutes due to mistakes by Thibaut Courtois and Gary Cahill and saw Swansea lead. With the bicycle kick, Chelsea and Swansea went to a 2-2 draw and also an injury to John Terry, who was barely standing at the final whistle.