There's not a lot details of this video of a near collision between a fighter jet and an airliner. Taken from the fighter's cockpit, it seems that the pilot—who is Italian—was completely taken by surprise. It could have been a full frontal hit.
Imagine the face of the pilots in the airliner.
My italoñolo is rusty, but it seems that the pilot says that he saw it at the last second and wasn't expecting it. Then air traffic control asks him to check his course and change altitude, but I may be mistaken. Any Italians care to translate the conversation in the comments?
If the video doesn't jump, go to the 3:45 mark.