Sports Celtics’ lack of killer instinct lost them Game 1 — and could cost them series vs. Heat May 18, 2023 Dan Wolken, USA TODAY Comments Off on Celtics’ lack of killer instinct lost them Game 1 — and could cost them series vs. Heat The Celtics' inability to put together a complete 48-minute effort was on display again as Jimmy Butler and the Heat stole Game 1 in Boston.