It was gruesome for anyone who watched it — just 5:15 into his Boston Celtics career, Gordon Hayward sat on the floor under the basket with his foot and ankle facing the wrong direction. There was no question from that moment he could well be out for the season. What we don’t get to see is the rehab — the surgery, then the daily grind of physical therapy. Gordon joined The Dan Patrick Show (broadcast on NBC Sports Network) on Wednesday and talked about the injury. Patrick asked an insightful question: Which has been harder, the physical pain or the mental depression from the injury? “Definitely the depression. It’s been painful, but it’s nothing like sitting around watching the team you were supposed to be playing with this year. I signed to play for the Boston Celtics this year now to only sit and watch the Boston Celtics this year. That part has been difficult and much more difficult to deal with than the pain.”