Why did Oswald go get his revolver?

[John Corbett]

I thought it deflected off the window frame?

AI explanation:
"Deflection by the window frame: The bullet struck the wooden frame of the window Walker was sitting near, changing its trajectory. This is a common factor in missed shots when a projectile hits a solid object before reaching the target Kennedys and King.

Walker’s quick reaction: Witnesses say Walker lowered his head just before the shot was fired, reducing the chance of a direct hit LSU Press.

Bullet fragmentation: After hitting the frame, the bullet broke apart, scattering fragments that caused only minor cuts to Walker’s lower right arm."

If it deflected off the window frame that would be an indication his aim was high unless he trying to aim at the window frame.