Why does heraldry fail?

[Witch Mountain]

Ah!, silence. That's the answer. Heraldry fails because of silence.

Dear R. Sale, when you say "heraldry", which definition are you referring to? And what do you mean by "heraldry failing"?
Oxford gives me three definitions of "heraldry"

• the system by which coats of arms and other armorial bearings are devised, described, and regulated.
  
• armorial bearings or other heraldic symbols.
  
• colorful ceremony