Steve Kerr has seen a lot in his three-plus decades in the NBA, so the Warriors coach is no stranger to instilling the needed motivation when his team finds itself in a rut.Sometimes it’s a pep talk; other times it’s a fiery display on the sideline, with the latter proving invaluable in the Warriors’ thrilling 109-108 win over the San Antonio Spurs on Friday night at Frost Bank Center.Kerr received a technical foul in the fourth quarter after vehemently disagreeing with a loose-ball foul called on Jimmy Butler with 7:25 remaining in the game. Kerr’s animated display sparked something within the Warriors, who went on a 27-19 run to snatch a one-point victory in the final seconds.After the game, Warriors star Steph Curry — the star of the night with 49 points — explained how much of an impact Kerr’s energy has on him and his teammates.“We love it, he has broken clipboards along the way, he has gotten technicals — he gets fiery,” Curry told reporters after Friday’s win. “This morning, he was in his bag in terms of his speech he gave in our pregame meeting this morning. You can tell he still has that fastball if...