Sentence:  He met Luis Suarez's cross at the far post, only for Chelsea keeper Petr Cech to show brilliant <WSD>reflexes</WSD> to deflect his header on to the bar. Carroll turned away to lead Liverpool's insistent protests that the ball had crossed the line but referee Phil Dowd and assistant referee Andrew Garratt waved play on, with even a succession of replays proving inconclusive. 
Meaning of the word marked with <WSD> tags:  An automatic response to a simple stimulus which does not require mental processing.