Why? Is it because they spotted me and were warning each other?
My observations suggest that deer only bark when they are relatively undisturbed and they become less vocal when pressure from hunting is high.
If these deer had spotted you they would’ve simply melted away or even bounded off at high speed at the first sign of danger.
The fact the deer kept ‘talking’ to each other while you made your way through the wood says quite a lot about your deer stalking skills.