[1.1.2571] You can force incapable of violence pawns to attack

[BlackHunter]

Incapable of violence pawn will still melee attack enemies if there is no other path to his destonation except through that enemy, but only once per move order.
If you want to reproduce it, you can simply order that pawn to move at the cell where the enemy stands, or use a 1 cell hallway.