The phrase "breathes fire" is often used to describe someone or something that is passionate, intense, or angry. However, there are many synonyms that can be used to convey a similar meaning. For instance, one might say that someone "seethes with rage" or "burns with fury." Similarly, one could describe a passionate performance as "fiery" or "explosive." Alternatively, if the intensity is directed specifically towards a particular person or group, one might say that the speaker "lashes out" or "spits venom." Ultimately, there are many ways to convey the idea of someone or something that "breathes fire," depending on the context and the intended effect.