Well dont you think that our senses and brain are connected? If you control what someone feels, tastes, hears, sees, and smells dont you think you can do some very mentally harmful hings to cause mental damage?
When you hurt yourself in reality those nerves and impulses are received to your brain, and thus you feel it. If you are inserting your chakra into ones brain and making them feel whatever you want, basically at your mercy you can make them experience unthinkable pains. Do you see what Im talking about now?
When people say the senses, thats just the tip of the iceberg.