[Meet the New Boss]

There were a few rounds fired before he started with the long bursts.

You can hear the rounds beginning at around 3:12 of this video.

https://www.youtube.com/watch?v=muiHkkbPpdU&feature=youtu.be&t=190

You can hear a few cracks first suggesting the first few rounds were coming in the direction of the person recording. The long bursts come later.

[Sacajaweau]

The first spurt sounds like it jammed.