Sally would make a terrible class president. she may be good at debates, but she is a terrible saxophone player!

the logical fallacy used in these lines is because

in the thematic approach, an interpreter relies on a central theme (i.e., a major point or message) to guide development of a communication activity or device. in presenting the activity or device, the thematic interpreter develops the theme in such a way that it will be highly relevant to an audience.

explanation: