Daniel 6:14 (ESV)

14 Then the king, when he heard these words, was much distressed and set his mind to deliver Daniel. And he labored till the sun went down to rescue him.

Now Darius fully understands what was behind the request of all those high officials. He blames himself for falling for their ruse. How can he still save his friend Daniel? This outcome was never his intention. It appears that Darius is now the only obstacle to these high officials and the devil. The devil has made sure that his plan is devilishly clever. No matter how frantically Darius is looking for an escape route, it is nowhere to be found. He keeps trying until nightfall to come up with some solution.