Keep in mind what im quoting below from 2 scenes from the screenplay (Mace/Palps/Anakin)/(Dooku/Palps/Anakin) and 1 quote from the Making Of Book is not to show Mace uses the darkside, ever, but to show that Mace's conduct during the Palps duel towards the end was very un-jedi like. He did not get the chance to follow through with it, however, so the point is moot, but here it is anyways: _______________________________________________ ANAKIN cuts off COUNT DOOKU's head. A huge EXPLOSION somewhere deep in the ship rattles everything. ANAKIN: ... I couldn't stop myself. PALPATINE: You did well, Anakin. He was too dangerous to be kept alive. ANAKIN drops COUNT DOOKU's lightsaber, moving to PALPATINE. ANAKIN: Yes, but he was an unarmed prisoner. ANAKIN raises his hands toward PALPATINE, who is strapped in the Admiral's Chair. The Chancellor's restraints pop loose. ANAKIN: (continuing) I shouldn't have done that, Chancellor. It's not the Jedi way. __________________________________________________ PALAPTINE: "I can't... I give up. Help me. I am weak... I am too weak. Don't kill me. I give up. I'm dying. I can't hold on any longer." MACE WINDU: "You Sith disease. I am going to end this once and for all." ANAKIN: "You can't kill him, Master. He must stand trial." MACE WINDU: "He has too much control over the Senate and the Courts. He is too dangerous to be kept alive." PALPATINE: "I am too weak. Don't kill me please." ANAKIN: "It is not the Jedi way..." MACE raises his sword to kill the CHANCELLOR. __________________________________________________ "But Mace was going to arrest Palpatine," Knoll says, "and a few moments later he says Palpatine's too dangerous to live. What happened?" "Mace was going to do the right thing by arresting him, but after Palpatine does the lightning, he changes his mind." -GL Once again, Mace never uses the darkside, he possibly ALMOST uses it there at the very end, but even then that choice was taken out of his hands by Anakin.