Grip and Fling require focus to perform. In the heat of duel, you rarely have that opportunity. It can be used descriptively as part of your move, if you so desire. Dooku certainly used Fling in his second showdown with Kenobi and Skywalker.
None; damage is dealt when the winner of the duel is successful.
"I know when to use advantages," Lothar retorts.
Denzral's flashy display does not make contact with Lothar's flesh. It certainly gives the Dark Jedi reason to pause and hold back, deflecting anything that comes close with sturdy blocks.
Denzral's Agility move outflanks Lothar's Strength move, and Denzral backs up into the cave, out of the altar room.
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Lothar: 0
Denzral: 1
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Lothar to attack. When he realizes that you are trying to pull back, he comes at you with a series of powerful slashes designed to wear down your defenses.
"Are you so weak that you cannot stand and face me?" Lothar sneers.