First of all, I would like to say that this is very matchup dependent. This is just something I've been experimenting with and has won me a few matches online. Basically what you do is after an Air Throw, dash backwards halfway and throw a Spear. If the opponent tries to jump out or if he ducks too late (which is a mistake in the video), he'll be caught into another 30%+ combo. If it gets blocked (high or low), you get 1% chip damage and you're most likely safe since it's fullscreen. However, there are instances where the opponent can stay on the ground, get back up and punish with a teleport. Once your opponent knows their safest option is to stay still, you can mix it up with Hellfire for an additional 7% damage (the timing for this is to make a full backwards dash then use Hellfire).
Tech Rolling: For those who don't know, the opponent can't tech roll after Air Throw, but what he can do is stay on the ground for a split second then press a button to tech roll (like the Back button). This tech roll is different because the opponent can't use a wake-up attack after it. If the opponent does this kind of tech roll, the Spear does whiff and the opponent recovers just a little bit faster than Scorpion, but since it's fullscreen you should still be able to block in time.
The only problem with this is wake-up attacks, and even then, the Spear can snuff out some wake-ups. It doesn't work too well against armored wake-ups. I doubt an opponent will be willing to use an armored wake-up after an Air Throw anyways (unless the opponent can react to Spear). If the opponent doesn't armor the wake-up, then I'm pretty sure Spear will beat moves like Reptile's Elbow Dash. It's not something you should do every time, so sometimes you can block instead of using Spear and punish wake-up attacks.
Works good against:
Scorpion, Ermac, Kitana, Sektor, Sonya, Shang Tsung, Kenshi
Doesn't work good against:
Kung Lao, Mileena, Cyrax, Smoke, Kabal, Raiden, Skarlet, Rain, Freddy Krueger
You can still do it against every other character since their wake-up attacks don't lead to full combos.
And before I get replies like "Why risk eating a wake-up attack?" or "Why not use Vortex/Void?" well I just think this is another one of Scorpion's "risks". Scorpion can't be punished by full combo (besides the characters it doesn't work good against) and the opponent will have to use meter so IMO the reward is higher than the risk, a.k.a.
low risk high reward. If you do use it against characters like Kung Lao, it becomes high risk high reward.