What tank are you in when these vanguards are 200m away? Unless it’s something with an absurd camo rating like a borsig, you’re going to be lit up even if you don’t fire. For reference a borsig or iron rain needs opponents to get at least 230m away from you to spot you. This is a better camo rating than most light tanks, even the vanguard

Obviously if you fire you break your camo and they’ll spot you from further away. As for pulling behind the bush and firing, this seems dodgy to me. Half the time someone can be extremely close to me and I won’t be spotted, half the time they’ll spot me right on the edge of my detection circle

We’ve never quite had the same bush mechanics as on PC. It seems really dodgy. Sometimes they work, sometimes they don’t