Looking back, you're right. He didn't identify himself at the start. He didn't until the second the he tried to question him, when Nunes walked back (44 second mark, in the video I've seen.) No idea what kind of protocol reporters have, but it'd have been more responsible for him to have stated from the start what agency he was with.

Regardless, he's not guilty of stalking.

He was a reporter that announced himself as such in a public space. Nunes is innocent, but so is that guy. There's a video of the whole encounter.