From a Washington Post story by Kyle Melnick headlined “Judge says flipping the bird is the right of ‘every red-blooded Canadian'”:

The Canadian neighbors had developed a distaste for each other after arguing for months, but an interaction in May 2021 upped the ante.

As Michael Naccache watched Neall Epstein walk by his house, Naccache held up a drill and cursed at Epstein, according to court records. In response, Epstein flashed his middle fingers and swung his right arm in a dismissive manner, which Naccache believed was a throat-slashing gesture, the documents state.