PHILADELPHIA, PA - MAY 7: Head coach Brad Stevens and Jaylen Brown #7 of the Boston Celtics argue with referee Scott Foster #48 after a foul was called in the third quarter against the Philadelphia 76ers during Game Four 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. NOTE TO USER: User expressly acknowledges and agrees that, by downloading and or using this photograph, User is consenting to the terms and conditions of the Getty Images License Agreement. (Photo by Mitchell Leff/Getty Images)