woulda, coulda, shoulda
Not a trivial point.
The U.S. military is well-known for preparing after action reports and lessons learned. So let's hope they study this incident and learn from it -- just as they would from a regular "battlefield" engagement.
If they do so, perhaps there's reason to hope the next jihadi-in-uniform who tries something like this will be rushed and tackled after his first shot.
(And let's have no doubt: There will be other such incidents.)