His pass to Lichtsteiner ahead of the 2nd goal was the true blow for Lazio in that move. It completely opened them up and sent Licht clear through on goal. Lichty could've probably finished the move off himself, but instead opted to pass it to Chiellini who was in an even better position. But Vidal's pass was the killer component in that move. It made Licht's and Chiellini's tasks pretty easy.