Half-life: Flying Ichthyosaur destroys Apache

This video is based on this one from andfc: I kept experimenting with that fish for a while and found out how to fly on him. Basically you have to make him swim vertically up to you. He will then stay right below you and do nothing. That allows you stand right on its head (even though you can’t see him since he’s below the water surface). Now if you jump he will follow you out of the water and start flying. Once he’s in the air there is no way to change his direction of movement so you have to get the correct direction and forwards speed at the first jump when he’s still in the water. Then just move forward to stay on his head and jump several times until you have the desired height. Once you are over the helicopter just drop down and the fish will also stop his flight. Upon landing on the apache he will be stuck and usually simply do nothing. However if you get right infront of his head he will sometimes try to attack you. Since his head is stuck in the apache there is a high chance he will damage it. For some strange reason he will then keep attacking until the helicopter is destroyed ... actually I have no idea why it is that way. Anyway... that’s the time to jump off. Once the helicopter explodes it will do alot of damage. Oh and of course the helicopter usually does not hang in the air like that. It should be flying around and attack. But he does not instantly become active once you load the map. There is a trigger at the road where you came from. Only once you move through that trigger it will start moving. You can simply avoid that trigger by slowly sliding up one of the rock walls at the side (or some other trick). Then you can have fun with it. So... well, that’s how that vid came to be.