What to do with a straight black pine?

As part of the Easter Internship of the International Bonsai Academy Alex has provided his Austrian black pine, Pinus nigra Austriaca. He has collected this tree many years ago and brought it to a refined stage. But it is very straight and not so exiting. So we decided to give it a bend. But is it impossible to just bend this maybe 100 years old trunk. See what they are doing? Walter is helping Alex here.