William Powell's trip to England was short and not so sweet. Powell, a practice-squad running back, was waived by the Detroit Lions this morning, one day after he traveled to London with the team for Sunday's game against the Atlanta Falcons at Wembley Stadium (9:30 a.m., Fox). It's not quite the New England Patriots cutting receiver Tiquan Underwood the day before the Super Bowl, but the Lions cut Powell to make room on the practice squad for safety Jerome Couplin, who was waived Monday so that the Lions could sign tight end Kellen Davis. "It's a difficult thing to do, and you certainly would not want to do it -- a guy just gets here and, within 48 hours, he's heading back home," Lions coach Jim Caldwell said. "But that's kind of the nature of our business. The guys understand it, and I think, if you're up front and you tell them exactly why and what the reasons are and those kinds of things, it's a bitter pill to swallow, but they understand." Couplin made two tackles in seven games with the Lions, but his role on special teams had dwindled as safeties James Ihedigbo and Don Carey returned to health in recent weeks.