You might want to pick up a book called, "On Combat", by Lt Grossman, to understand the physiological things that happen to us when we're in a life or death situation. Though it's geared towards soldiers and LEO, most of it applies to any of us.
Shaking? That's totally normal.
As others have pointed out, it's just adrenaline dump.
Tunnel vision, impaired fine motor skills, changes in hearing, vision, and even embarrassing bodily functions like defecating or urinating are normal things that can happen.
When I confronted a BG in my own home, I misdialed 911, not once, not twice, but THREE times.
Everything you did sounds text book perfect. Pat yourself on the back.
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