From the Terminator 2: Judgment Day trivia page:
She beat him right out of the movies!
The "forced medication" scene (Special Edition only) had to be re-shot several times because actor Ken Gibbel wouldn't hit Linda Hamilton properly with his nightstick. The scene was very physically demanding and Hamilton was furious with Gibbel because he repeatedly botched it. She got her revenge in a later scene where she beats Gibbel with a broken-off broom handle - the blows are for real.If you check Gibbel's IMDb page, you'll notice T2 is his last acting role.
She beat him right out of the movies!