Inglorious assholes

It's 2:44am, I'm just back from the cinema for "Inglorious Basterds". That's my first cinema in months. Cinemas are way over my budget, but a friend invited me.
The reason why I'm home so late is because it was the last screening and because I walked home, to save on a bus ticket.
I got delayed by someone too. I was walking in a rather lonely street when a voice called my attention. Lying on the sidewalk accross the street was a guy in green sweater, his hand waving at me: "Can you help me". That's when I noticed the wheelchair behind him.
The guy had tipped over, and he couldn't get back on the chair by himself. I walked up to him and followed his instructions as closely as I could. He was speaking german way to fast for me to understand. He was drunk too. And he might have had to wait for a long time before I showed up. Because from the smell, he obviously had taken a piss break right where he was.
I'm not a very strong guy. And he was a bit fat. I failed to lift him once. And I noticed a couple that were coming our way. So I told him to wait and called the two up.
I didn't really ask them if they could help us. That went a bit without saying, yeah? I just told them: "Hey, you're going to help us. You, hold the chair steady. You, grab him under the left arm. 3-2-1-go". I realised later that they might have needed a bit of convincing.
When the guy was back on his wheels, he thanked us and started to roll on... Painfully slowly. He was pushing with his leftover leg and both arms. I asked "should I?" grabbed the chair and pushed him on.
He told me he was going to the Holstenstraße station, which was completely out of my way. The couple had started walking away. I called them up: "That's out of my way. Are you going in the direction of Holstenstraße?" - "No, sorry". Well, it was just a 30min detour.
At the first crossing, where I would have needed to take a left, I went straight, so did they. At the following crossing, I turned right, so did they. The crossing after, I went straight, so did they...
In the end, they just walked all the way to Holstenstraße, 100m behind us, on the opposite sidewalk.
What was it? What exactly is scary in a 40 year old, drunk, one legged guy that fell off his wheelchair? Were they afraid of catching one-leggitis?
Given the movie I had just watched, I was tempted to run back after them, knock them to the ground and draw a nazi cross on their forehead with the tip of my knife. But I didn't have a knife. I just gave them a big "Fuck you!" punctuated with a finger high in the air.
I'll carry a knife on me from now on.