I see nobody has provided the correct answer to this so I will do it.
It is really simple @Willess12 I think you simply misunderstood that part of the comic completely. It is no error, Nokama takes the Krana Kal from Pohatu and Onua and tells them that she learned something similar from another Krana Kal, which the boxors acquired. The stuff with boxors is a separate event from the Tahnok Kal trap.
If you want a detailed record of the movements of Krana Kal, I analyzed it here: