This is what I find interesting:
...I would like to see this tree. It must have been pretty big, otherwise he could have probably at least wounded/disabled him, with FMJ 5.56 ammo.
The History Channel iirc did a comparison of the AR and AK. They demo'd them both shooting through a tree trunk on an indoor range. The tree stopped the AR .223 rounds but not the 7,62x39 ones.