[Col Frank Slade]

The 2 critical questions :

1- Why was live ammo on the set ?

2- What motivated Baldwin to point the gun at the cinematographer and pull the trigger ?

[marcusmaximus]

Point the gun at the cinematographer and blast her in the chest at near point blank range.

[marcusmaximus]

Also there are conflicting reports whether Baldwin shot her in the chest or shot her in the back.