Washington Yard shooter: What is Microwave hearing?

On Tuesday, the Washington Navy Yard shooter's stepfather Frank Calderon said that Aaron Alexis was walking out of the World Trade Center subway stop on 9/11 when the first tower collapsed, and that he stayed to help pull bodies from the rubble.

"Aaron said he was on the escalator coming up from the subway station when he saw the building come down. It was right in front of him, and he said he saw it collapse,"

"That day was traumatic for everyone involved. He did not talk much about it, but he said he helped out. He was a strong young man, so he would have done what he could."

But was Aaron Alexis really that strong?