when jubel.was being accused of the poisoning of the princess , father thought that he should quickly get her out of the situation or the emperor might order her execution so he took her the shadow prison " endure it" by this he meant that hang in there till I get you out of there , but with the sword I am still confused maybe it was the symbol of his word to her.
As we all know that the father indeed loves jubel and the reason why he kept her a distance ( because I think whenever she comes in contact with her father some magical shor circuit happens as seen in one of the ch ) .