"Another department spokesman said on Friday that it would be difficult to determine who was responsible for Mr. Damour’s death."
If someone representing Wal-Mart, say the store manager, asked this man to go near the front doors then the answer seems to me that Wal-Mart is responsible. Even if he did it of his own volition since he was acting on behalf of his employer Wal-Mart would still seem responsible. Wal-Mart created the unsafe situation and placed Mr. Damour in it.
John Thornton