Kunze Panzer: Encirclement Tactics - World of Tanks 

Hello, the crew is of great importance, but here the low profile of the tank and the use of double bushes protected the player. Have a nice day!

If you shoot from 15 metres away from the bush while you are in a bush, you won't get spotted. If you take a look closely you'll see that when he shot the enemies he moves close to the bush to respotting enemies. If you don't stay 15 metres away from the bush and you don't shoot, they won't see you, but if you shoot in the bush and you don't stay 15 metres away from it, you'll get spotted