Ritchie SWATed this guy to death. In my book, this was premeditated murder using the police as the murder weapon.
At the last minute he drops the gun and tries to crawl away.
I'll go watch it again, but it looks like he decided against WHATEVER was in his mind and tried to get away.
An idle kid with a long gun in a store at 8 in the morning is just asking for (at least) serious psychiatric help