You've just described a bog standard armed response unit. Been about for years sir.
We had them storm the pub I used to work in / live above when we had some trouble with some Turks with bits of wood. I asked them if it was standard operating procedure to send an ARU to deal with people with sticks. His response: "Well, we didn't know how big the sticks were" - knob.
Then the same two came back when the fight inside the pub spilled out into the street, with about 50 people getting involved. Was all a bit of fun until someone pulled out a shooter. I had to be "interviewed" by one of them who wanted to arrest me cause I wouldn't give him everyone's name and address. But they're just the same as normal coppers. Some of them are knobs, some are sound.
Just cause he's a big lad doesn't make him a thug. Also, if he's bigger than you then it's more of a challenge. Embrace your fear