If I had a shot and took it, it wouldn’t have worked. He was in all over body armor with a ballistic helmet.
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You are selling yourself and your weapon short.
Civilian body armor when struck by as small a caliber as a 9mm transmits force that can do a lot of damage to the wearer. It can break ribs, knock some people down, etc. At the very least it would throw off his aim.
Newer military armor transmits less force to the wearer but it is still substantial and it takes a strong person to keep shooting after just a couple of hits.
I’m rather assuming he was decked out like those LA shooters from a few years back. They gun down quite a few cops while under fire from said cops taking the hits and keeping on going. Of course I don’t have any real details, but he seemed to really have it planned out well.