The fallanasi looping technique. You cannot sever a force connection when it is hidden from you. You cannot sever a connection that isn't there.
Can you link where that is said or show an example ?
And the part about being more powerful means being more resistant to force techniques? This is thoroughly shown in Darth Bane: Path of Destruction.
If its as easy as you said it is, the exile would have been simply severing everyones force connection and not waste anytime drawing out a lightsaber to beat Sion and Traya and all other foolish enemies to a pulp.
The only case I can think of is Nomi Sunrider and Ulic Qel-Droma ("Who was probably more powerful than Nomi") but at the point he wasn't fighting it either.
Exactly. He was devastated
and his whole guard was down.