A Sub Trope of Puzzle Boss, and often a Bullfight Boss, the Ring Out Boss is a type of Boss Battle where the boss himself cannot be just defeated via damage, but has to simply be knocked or thrown back into a dangerous substance or obstacle to cause damage. Very much the Boss Battle type used when the hero fights the Implacable Man or a character with Nigh Invulnerability.
There are two types of [...] [tvtropes.org]