NBA Sitch. 8 second count.

[ca_rumperee]

Houston @ GS Warriors the other night.

GSW hits a basket, but HOU is up by 1 with 18.5 seconds to go. Warriors pressure the HOU inbounds play in the back court, apparently looking hard for a steal rather than a simple foul.

HOU struggles a bit advancing the ball, but GSW ultimately fouls in the back court with 12 seconds left.... no back court violation.

My question is, any idea how the refs count this 8 seconds? I don't think that I have ever seen a manual count in the NBA. I always thought that they used the shot clock. But in the above sitch, the shot clock was turned off.

Do the packs they wear buzz at 8 seconds?