Cleveland's library arranged some books before Wednesday night's win that spelled out the phrase:
"Cleveland Invasion, Boston ... The Luck Runs Out."
The Cavs beat the Celtics Wednesday night 117-104.
Boston's library responded by stacking several book titles to say: "Never back down ... the good fight continues ... Friday."
Cleveland takes on the Celtics again in Boston Friday for Game 2 at 8:30 p.m.