I didn't stop, for fear of getting wrangled into an attempted hustle (even if I want something, the moment someone tries to "sell" me on it I resist). Instead I did the "turn and look".
He was selling "original" paintings. Most were small: 3 x 5, 4 x 4. Most were loose images of superheros: Spiderman, Batman.
There were a few that were particularly peculiar; little recreations of Ivan Brunetti panels.
Too shocked to stop, too mystified I passed by. The rest of the day I kicked myself. I should've stopped. I should take pictures and send them to Brunetti.
The next day the vendor was still there. I laid down $20 and didn't say a word.