NET
14 When the king heard this, he was very upset and began thinking about how he might rescue Daniel. Until late afternoon he was struggling to find a way to rescue him.
Darby
14 Then the king, when he heard these words, was sore distressed thereby, and set his heart on Daniel to save him; and he laboured till the going down of the sun to deliver him.
KJV
14 Then the king, when he heard [these] words, was sore displeased with himself, and set [his] heart on Daniel to deliver him: and he laboured till the going down of the sun to deliver him.