Despite the clear difference in size between a basically six-meter large king cobra and Guardian, the old cobra actually didn't raise his body, so that he had to look at the lynx from below, which in other words means that the old cobra has to know about Guardian's "status" and role in the forest though he isn't a king.
"Hisss!", the other cobras apparently are not the same because when they saw their leader's stance, they started getting impatient, until the old cobra told them to remain still.
"Grrrr", once the initial greeting between those two which established the hierarchy had taken place, Guardian told the old cobra that they wanted to have a private meeting with him.
To which the old king cobra leader accepted, the other cobras didn't understand what the lynx was saying, but they obviously didn't like that their leader was going to be left with a group of estrangers so Aster intervened.
