No, Ivo. Were I to interact with the guy it wouldn't really be street. You might want to read my article on street photography at https://luminous-landscape.com/on-street-photography/. Street's my favorite thing. Now that I'm retired and tucked away in Florida I don't get as much chance to do it as I used to. You can see a bunch of my stuff at http://www.fineartsnaps.com/, even more at www.russ-lewis.com.
Tx to point my to your article, Russ.
The definition of street photography is one of the most derailed topics on photo fora all over the world. :-)
Hm, I'm a bit confused by you excellent article.
About interaction outside the shutter speed
Here in Europe, portrait right and privacy is gradually becoming a topic. I walk around with a few blanco portret right waivers in the back pocket. Sometimes the interaction is merely a subtle lifting of my camera and a nod of the person. Sometimes this would ruin the shot an I take the shot, but if the person is the main subject and I think the frame would make it to an exhibition or even public on the net, I ask afterwards and show the picture. Most of the time peoples smile and ask to send the photo. Sometimes I have to delete, and I do. And in a rare occasion, a waiver is filled in.
This all doesn't apply for shots where there is no real focus on one person or the person obviously act in a crowd.
About interaction within the shutter speed
If the photographer places himself in the action and act as a part of what is going on, does that disqualify the images as street photography?
I have few particular HCB picture in mind:
The boy with two bottles of wine, proudly marching in the eye of the camera
Two man peeping trough a fence and the one with bowler hat clearly noticed HCB
(I don't know if it is fine to link to these images)
This is a picture of myself, does this not qualify as street photography?