"He doesn't claim that Martin 'confronted' him, for example. He claims that Martin hit his head against the sidewalk repeatedly."
The quotation marks are important. If I'm interpreting him correctly, vitus is saying that Martin didn't use the vague word "confront," but much more specific language specifying the violent nature of that confrontation.
EDIT TO ADD: I haven't read the actual statement, so I don't know myself what language Z used.