One day two summers ago, Jarrett Jack received a text message from Kevin Durant.

"Can you talk real quick?"

Jack was thrown off by the seriousness of the question. The two had known each other since childhood, dating back to their days in the DMV (D.C., Maryland, Virginia area).

Durant looked up to Jack, five years his elder, and the previous summer invited him to his Los Angeles home. They spent a week hanging out and working out. And yet, to Jack, something about the tone of the text just seemed, well, different. It wasn't how he and Durant typically conversed. They got on the line.

"What's Steph like?" Durant asked.

It didn't take long for Jack to connect the dots: Durant, a free agent at the time, was considering signing with the Golden State Warriors, the reigning championship runners-up, coming off a record 73-win season and looking for a boost to help them reclaim their throne from LeBron James.

The Warriors' recruitment of Durant had begun immediately after their Game 7 Finals loss to the Cleveland Cavaliers that June. Durant was intrigued but also unsure. Choosing where to sign would be the most important decision of his life. He needed more information.

Jack spent the 2012-13 season with the Warriors. He witnessed firsthand the early stages of Steph Curry's meteoric rise—Curry, while accepting his MVP award after the 2014-15 season, thanked Jack—and served as a mentor to Draymond Green.

"J-Jack was probably the first guy I called," Durant said. "Because it's different when you talk to coaches or guys that have just been around. Jarrett was on the floor with them when they started to make their turn. I knew he was someone I could trust, someone who understands the player's perspective."

Jack told Durant he loved everything about his time with the Warriors. "You're a great dude. They're a bunch of great dudes. You'd like it a lot," he said. Durant signed with Golden State and led his new team to a title the following June. He was named Finals MVP.