the snaffle part acts just like a regular bit, while the hackamore part applies pressure on the front of their face (like when ypu pull on their halter to slow them down). some models also apply...
The sliding gag bit is used the same as any other bit. The difference is that it can be as gentle or severe as you make it depending on the amout of pressure applied to the reins.
The air you breath is approximately 21% O2 when you breath out its about 15% O2. When you breath into a person, you are breathing for them. Its the same thing as if they were breathing on there own,...