You can turn through teammates a little with a load of long stab weapons, including Danishes etc. The most blatant example is the pike though, which can stab straight through any object of less than a meter thick, including teammates, gates, horses and entire walls. The only reason it can do that is because they removed the hitbox of the first meter closest to the player so it can't stab up close. Restore this hitbox and it won't be able to stab through walls, but it will be able to stab at facehug range.