The wonderful blessing of war

In the most famous boxing match in the history of the world, Yakov battles the Angel of Eisav. Ever wonder why the Angel started up with Yakov precisely as he was about to make peace with Eisav? Why specifically then? And even stranger, after Yakov finishes the fight and gets severely wounded by the Angel he asks the Angel to bless him. Why would you ask your enemy, who just made you permanently crippled to bless you? The answer might surprise you.