Silentglade is extremely quiet, he only speaks to two cats and sometimes four. Riverstar, Dawnlight, and his mentors Typhooncall and Whistlesprout.
Most cats say he's mute, that he cannot speak though away from the eyes of others he speaks freely to his family and the two cats who mentor him. 

Silentglade chose to become an Ambassador's Apprentice to break down his walls more and bring Fadedclan and other clans together, this brought him to learn that he has a very keen memory and he often stays silent and remembers the main details of the conversation and relay's them back to Riverstar who informs Bluestone as well. ​