As you can see in the footage I couldnt get through the tree, but enemies did. Hitting and going through kind of parts is common on every map, mostly enemies are in the ground when they come from a stairs upwards. The last 2 steps they ignore, just staying in the ground fighting. Then they teleport out of it, hitting instantly most of the times.
Many times roaming enemies are in trees, walls, etc., and sometimes you can hear a backstab sound, but you cannot see anyone, cause they finished the attack animation and got back to their hide.
This phenomenon is common on all maps, just lots of the times happenes during hordes, and you just thinking about what did actually kill me.