If you get involved in a fight, fight to the very end. This is the rule that Kostya Panfilov, nicknamed Zhigan, learned in special forces troops—in the mountains of Afghanistan, and on the prison zone. But here’s a slip-up: the businessman’s wife he was guarding was stolen—so to speak, right from under his nose. Zhigan doesn’t forgive. If the enemy struck and hid in their den, then you have to go into that den. And then we’ll see…