Pillagers in patrols make a lot more idle/ambient sounds than they should

I came across a Pillager patrol in survival the other day, and when I approached them, I noticed that they were making a lot more idle/ambient sounds than regular pillagers.

I have a video below showcasing this. It's all coming from the one pillager on screen. The other pillagers weren't really close, so it's guarantied to all be coming from the one pillager on screen.

Apologies if the audio is bad, recording Minecraft on my laptop is not easy for me to do.