OMAHA, Neb. -- When Anthony Ervin was Caeleb Dressels age, he was on the cusp of winning an Olympic gold medal.Sixteen years later, theyll pursue one together. It wont be easy.The U.S. lineup for the mens 4x100-meter freestyle relay that will try to reclaim greatness this summer in Rio is a microcosm of the way the team is shaping up as a whole: experience and fresh muscle shoulder to shoulder.It also features perhaps the most amiable sprinter in recent history in Nathan Adrian. The reigning Olympic gold medalist in the individual 100 freestyle hit the touchpad first in 47.72 seconds in Thursdays final. He called himself an old guy in post-race comments, but at 27, he is exactly midway between his prospective relay-mates in age.Adrian will be joined by speedsters separated by less than a second in the pool and almost a full generation on their birth certificates: the 19-year-old Dressel, a rising junior at the University of Florida who rewrote the NCAA record books last spring; 20-year-old Ryan Held of Springfield, Nebraska, who swims for North Carolina State and logged a personal best time of 48.26 seconds; and the 35-year-old Ervin, the irreverent, cerebral U.S. national team captain.Ervin, who shared the 50-meter freestyle gold medal with Gary Hall Jr. at the Sydney 2000 Games in an improbable tie, balanced elation with clear-eyed expectations Thursday.Once dominant in the 4x100 event, the U.S. team has won only one Olympic gold in its past four attempts (2008) and stunningly did not qualify for the finals at the 2015 world championships in Russia.Im not gonna celebrate too much right now, because the rest of the world is badass and we want to be bad too, said Ervin, who made a comeback in 2011 after almost 10 years away from competitive swimming. His recently-released memoir, Chasing Water, chronicles a self-destructive period in his life on dry land that included a suicide attempt.Part of this process being around these younger people makes me feel young, he told reporters. And I may be older than them, but Im younger than most of you.Dressel, his blonde hair sticking out in random spikes after the race, wrapped Ervin in an embrace that melded some of the teams most prominent tattoos.Not super-stoked about the time, but Im happy, said Dressel, who touched .51 behind Adrian for second place and will swim the individual 100 event in Rio. Its something nobody can ever take away. Im an Olympian now, and will forever be the rest of my life.Adrian, who trained alongside Ervin for four years in college at California, agreed that the world is faster, but he has confidence in the eclectic U.S. group. I think people are going to underestimate what the Americans are capable of, he said. 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Referee Nigel Owens explained to both captains that he had made a 50-50 decision to allow play to continue.Such events are virtually unknown - spidercams have only been in use in recent times - but a search through the archives reveals that an incident that occurred in the 1906 Wales-Scotland match at Cardiff is worthy of consideration.At the time, high social status was attached to attendance at Waless matches and even Cardiffs Chief Constable felt it his duty to be prominently seen when games were staged on his patch. He turned out in his finery as usual for the 1906 Championship clash, little realising he was about to play a part in the evolution of rugby unions laws.Early in the game the Scottish forward David Bedell-Sivright led a foot-rush into the Welsh quarter before toeing the ball over the goal line, only to see it rebound off the Chief Constable who was strutting his stuff on the field of play, five or so metres from the dead-ball-line. The Scot quickly adjusted his path and still won the race to touch down for what many believed to be a fair try.ddddddddddddIn the absence of any law relating to such circumstances, the referee ruled a dead ball on the grounds that he felt the ball would otherwise have rolled out of play. He felt the defending side should have the advantage and so a drop-out was awarded for Wales to re-start the match.There was sufficient controversy in the aftermath for the International Board to draw up fresh guidance. The good Chief Constable warranted his own footnote to the history of the games laws when the Board subsequently ruled that in future:1. If the Referee thought the ball would have gone dead he should have disallowed the try.2. If the referee thought a try would otherwise have been gained he should have awarded the try.3. If he were in doubt he should give the point against the side responsible for the ground.4. All officials and spectators should be regarded by the referee in the same manner as offending players on the home side.Different times, different circumstances, but if there had been spidercams at the time of the 1906 Law changes, then arguably Nigel Owenss decision in Sydney would have been absolutely right. ' ' '