How to close 6-5-4 KB with 1 key

In this article, I will show you how to close 6kb with 1 key.

I score a strip of poisons manually.
1 move mashaled a2, a1
Brago a1
Septimus a1
Catcher a2
Drak a 3
Here the main thing is that Brago missed the first move, the second move a2