It is unusual for professional batsmen to "walk"; that is, to agree that they have been dismissed and leave the field of play without waiting for (or contrary to) an umpire's decision. Gilchrist reignited this debate by walking during a high-profile match, the 2003 World Cup semi-final against Sri Lanka, after the umpire ruled him to be not out. He has since proclaimed himself to be "a walker", or a batsman who will consistently walk, and has done so on numerous occasions. On one occasion against Bangladesh, Gilchrist walked but TV replays failed to suggest any contact between his bat and the ball. Without such contact, he could not have been caught out.