PHILADELPHIA, PA - MAY 7: Head coach Brad Stevens and Jaylen Brown of the Boston Celtics argue with referee Scott Foster after a foul was called in the third quarter against the Philadelphia 76ers during Game 4 of the Eastern Conference Second Round of the 2018 NBA Playoffs at Wells Fargo Center on May 7, 2018 in Philadelphia, Pennsylvania. The 76ers defeated the Celtics 103-92. (Photo by Mitchell Leff/Getty Images)