The trope were someone avoids a battle by telling the enemy who they are. Doctor who has used it a few times.

Basically "Don't you know who I am? I'm Foo, and I'm Awesome! Don't you know how many people just like you I've killed? Step aside or meet their fate".

(I thought we had launched this already but I can't find it after much searching. Maybe it was before the crash, and didn't get relaunched after)