The Usain Bolts coming at him was definatly the reason he got nervous. Its not about players actually approaching that very second, more about expectation. If they would have kept that stuff up, they would have a very different game. Again though you dont run like Usain Bolt in 90 minutes.
For a better reference than that one, look what happens the sequence just before it. The collective pressure was jaw dropping.
For an even better reference, look whats happend to teams when they´ve faced Barcelona in the passed years. Teams like Milan, Arsenal, United, suddenly look absolutely horrible even when there is no evident pressure. They expect it, are out of the comfort zone, and suddenly an easy pass in midfield is an impossible task.