Bruce Banner couldn't be happier. He just defended his thesis, and now he has the doctorate in biology he's dreamed of for years. To celebrate, he sets out from Boston on a backpacking trip across Canada, taking in scenery and enjoying being in places where he doesn't know anybody and nobody knows him. On February 25th, 2001, he happens to be staying in Vanderhoof, British Columbia.
Also in Vanderhoof, British Columbia on that date: Behemoth.
In and above the city, the battlefield is a maelstrom of lightning, radiation, shock waves, and heat beams, plus the attacks of dozens of heroes and villains. Capes are dying left and right. Some manage to do damage to the Endbringer first; others die in vain.
Down in the shelters, it's impossible to tell what's going on above; all Bruce and the other unfortunates can do is extrapolate from prior knowledge and observed data. One very obvious piece of data is the shock wave that ripples through the ground around them, destabilizing the walls of the shelter and crushing him nearly flat under a pile of rubble. Bruce Banner has never been more terrified.