Thanks for reinforcing my actual point - about the futility of "gun free" zones.
Now, as for the point you're trying to make, that he accomplished nothing - well, let's look at that. He was at the Foot Locker,
which is actually at the opposite end of the mall from where the shooting took place (at the Walmart in the parking lot).
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Now, if we take his account as factual, what happened is he heard the shots, saw kids separated from their parents, and carried them to safety, while at the same time readying his sidearm in case the shooter came upon them. What you're implying is that he was useless (and perhaps even cowardly, if your line about bravery was sarcastic) because he did not sprint literally nearly the entire length of the mall to confront the shooter and end the threat. I would assert, on the other hand, that this is an unreasonable expectation of coverage from him, and in fact, rather more supports the other common claim that those on the left like to mock so much - that the real problem is there were not more like him.
After all, as ineffectual as he was for distance and response time, the police were apparently even moreso. Like the old saying goes that gun owners love to quote - when seconds matter, the police are only minutes away (and in the really big cities, hours - if at all).