Mistakes happen. Add extreme stress and fluid/ dynamic circumstances and bad things happen. She (officer) had less then 1/2 of a second to make a decision and try to deal with that issue. Welcome to the LE world. Remember that many of the things we do are lawful but still awful. Mistakes can cost you, your life or another LE partner. Or an innocent citizen and last the bad guy/ suspect. The job could not be more complex and no day is like the day before. Remember that if you were given those circumstances to make decisions in your chosen field or career you will have bad outcomes. There is no way, not to have bad outcomes. Even the haters cannot deny that set of facts. Last, remember that we in the LE profession can be charged for the things we do when we take action and things we should have done and did not. Not an easy job these days,