Idk what you've seen but I've personally never seen the second one lol it makes a dome made of bone around a target and can shoot spikes from any angle imaginable within the dome itself. Since it is limited to mid range I'm going to assume that's how big of a dome we can create but could be smaller if we'd like.?
The first one is the badass attack Kimimaro used right? That he was fishing into and stuff? If not then that's what it reminds me of. Making a forest of massive bones to cause havoc with.
Yeah, there's nothing to suggest it can't be smaller. It could theoretically encompass all of mid-range, but then you're inside of it as well. So just keep that in mind. And yeah, its his technique that he was transporting himself in.
Last two
( Nibai Hone Doragon ) - Double Bone Dragon
Type: Offensive/Supplementary
Rank: S
Range: Short - Long
Chakra Cost: 40
Damage Points: 80
Description: An advanced form of the it's A ranked parent technique. The user will release two bone Dragons which can bind the enemy and using further manipulation, bone spikes can grow from the Dragon's body to pierce the enemy or can be shot from its mouth. These dragons are notable larger than the parent technique, twice the size. The vital difference between these jutsu is the number of Dragon's made.
Note: Can only be used twice.
( Hone Tento ) - Bone Tent
Type: Offensive/Defensive
Rank: S
Range: Short
Chakra Point: 40
Damage Points: 80
Description: The user stomps the ground, making some of the strongest bones in his body to come out 360 degrees around him, forming a tipi made of bones. This gives the user 360 degrees protection against S Rank attacks or weaker. The tent can be used to trap the opponent, making them suffocate, however it is not as strong on the inside as on the outside, capable of being destroyed by A ranks from the inside if the element is strong to Bones. The user can cancel this tech at will as well, though it does not give protection against attacks that come from underground. Lasts up to two turns before the trapped target passes out.