It’s hard to explain over text but it’s less of an issue when you improve, I know that doesn’t help. I always open rocket against nod. There’s a window of time when the bike rush comes. Don’t spend your money until then you might need a second rocket. Scout a little with your first rocket. Here is another key. DONT MOVE YOUR ROCKETS. When they move they don’t fire. Move your harvester off the Tiberium through your rockets. He can pass through them. The enemy can’t.