Man kicking a puppy on Langham Road

I was just walking my dog on Langham Road near Downhills Park and saw a man with a puppy on a leash. The puppy was resisting walking, and the man began kicking the puppy down the street like it was a football.

I asked what he was doing and he started yelling at me and threatening to kill my dog. I called the police and told them about it and they said they would send someone. 

I followed him past Waldeck Road and then he doubled back and asked me if I had a problem with him and I said "I'm on the phone with the police" and he hissed "f*ck you" at me. By this point, the guy had zipped up the puppy in his backpack which he was wearing on his front (it was completely zipped, so the puppy will probably suffocate if it's not dead already). 

He turned onto Langham Place and I lost him. I wish I had taken a photo. Honestly, I was frightened that he was going to attack me and I think he would have when he doubled back if I hadn't been on the phone with the police.

The guy was about 5'11, black, around 30, some facial hair, wearing a blue coat and grey sweatpants with two blue stripes up the side. The puppy looked like a black lab, but it was tiny, probably only 8 weeks old. 

I know there's nothing I can do now, but I'm just posting because it was really upsetting to see. The police arrived about 15 minutes later but he was gone. I know someone kicking a puppy probably isn't the most important issue that police deal with, but I can't imagine that someone who would treat an animal this way isn't also hurting the people he lives with, too.