Paarthurnax seems to do that, however peculiar it may be in regards to an enormous creature with sharp teeth and claws. It's likely the voice. When one's words can do as little as bring flame into being or even stop time, one learns how to control it. Being a teacher for so many years has also helped. Unlike his poor Greybeard students, Paarthurnax knows himself well enough to keep his voice quiet when it needs to be... and raise it until the earth shakes when that is needed.

Yerks or Andalites... Paarthurnax shakes his head. "I am afraid not. Perhaps Colin may know. He knows many things that some do not. However, dealing with him sometimes require patience."