No, you're not stupid

.
Please refrain from saying such things.
But the jutsu is quite simple, you make the earth rise up and form something, so what you did was actually pretty much it.
(Doton: Arijigoku no Jutsu) - Earth Style: Antlion Technique
Rank: B
Type: Offense
Range: Mid/Long
Chakra Cost: 20
Damage Points: 40
Description: This jutsu causes the ground and everything on and around it to be sucked in towards the middle of a large pit, much like the method an antlion uses to catch prey. Upon being dragged to the center, the victim will then be sucked underground. There the victim, depending on how deep the user makes them sink, will be trapped and/or suffocated.
Now for one of the cool ones :zonder:, it's a bit like the split turn around palm, but it's more... Well... Hungry...