On hard mode of KF, each time an ogre is killed, a knight spawns next to the plate opposite the one the ogre started at.
It is normally considered the responsibility of the one on the plate to ensure the knight is killed, as if it gets to the orb left by the ogre, it will devour it and ruin the run.
Since there is no one on 4th plate, whose responsibility is it to kill the 4th knight?
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The group that i (Sometimes) do the raid with still chooses plates over numbers So instead of choosing 2nd position (whatever plate after where oryx slams) you choose a plate to stay at if you don't need to be on your plate you go to the middle. so lets say you are on the front left plate, but you are in the center, you still take care of the knight that you would normally.