In the mating season in late summer, female puffadders will attract males by secreting a pheremone. More than one male may be attracted to a single female. In the mating season males are known to engage in combat.
When fighting, the males will twist around each other and try to wrestle their opponent to the ground.
We witnessed such a combat late in the afternoon on a late summerday along the Nossob main road. The puffadders didn't give any attention to cars that were stopping and the people that were watching.