My guess is that the exposition wasn't clear that those who touch the *contents* of the box die (as recorded in old documents by Dowager Empress' country) but not necessarily the Arabella while reinforcing the seal? I don't know. I'm seriously guessing because confused too.
Also Mama Salvatore...
Love that the chapter succeeded in making most (if not all) readers just hop on the CecilxBertia train more and just made me feel absolutely disgusted by the original otome game plotline to basically justify all the changes made (accidentally) by Bertia (and Cecil) for a better life for them...
This is great. They're both mature about the agreement to not expect love with an arranged political marriage, but the mutual respect for each other as partners is there even without love. Especially how they both judge their partner based on what they do rather than act based on rumors like...