I think he means he wasn't afraid, since there's been this whole thing with Trump protesters, you know, punching people.
This part was my "favorite":
“What do you like about Donald Trump?” he asked.
“Everything,” said the man in the sunglasses, who later refused to give his name.
When the protester mentioned the Second Amendment, Mr. Cruz said he had defended gun rights in front of the Supreme Court. The man appeared unimpressed.
When he mentioned immigration, Mr. Cruz was ready with a bit of opposition research.
“May I ask you something?” the Texas senator said. “Out of all the candidates, name one who had a million-dollar judgment against them for hiring illegal immigrants. Name one. Donald Trump.”
“Self-funding,” the man replied.
“O.K.,” Mr. Cruz said, “so you like rich people who buy politicians?”
Or this:
“If I were Donald Trump, I wouldn’t have come over and talked to you,” he said. “You know what I would have done? I would have told the folks over there, ‘Go over and punch those guys in the face.’ That’s what Donald does to protesters.”
The catcalls of “Lyin’ Ted!” returned.
“O.K., stop,” Mr. Cruz said. “What word did I say was a lie?”
“About Donald telling people to punch people,” the man said.
This sounds made up, but I've had several conversations with Trump supporters that were almost exactly like this. Contradict one thing, suddenly the reason changes. Point out he said something, they say he didn't say it, even though we have him on video. And so on.