Let’s make Heroes 4 better.

No, let him stay in prison – he’ll learn who he shouldn’t fight against! Especially since so much money is being spent on him.

But who is forcing you to buy him? If you don’t want to, don’t buy him, but think about it: would a hero agree to betray his master for a small price? :) And also: you defeated the strongest enemy hero and, thanks to the War Bonds, prevented him from escaping, but he can still free the hero from your prison, and everything will start over. But if you buy the strongest enemy hero out of prison, you will also strengthen yourself, which will bring the enemy’s chances of winning closer to zero.