The Golden State coaches were enjoying a retreat of sorts, a weekend in Napa Valley before training camp began.
They talked about the importance of defending the NBA championship and, sure, enjoyed some of the area's grape-and-vine trappings.
But assistant coach Luke Walton knew something was amiss. The Warriors' head coach wasn't there.
Steve Kerr had undergone back surgery during the team's short off-season and hadn't returned.
A couple of days into training camp, Kerr called Walton at 7:30 a.m. and said he wouldn't be ready for the season. Walton, approaching only his second season as an NBA assistant, would be the interim coach for a still-undetermined...